diff --git a/CHANGELOG.md b/CHANGELOG.md
index b88cf35..7f26806 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 All notable changes to the LaunchDarkly Node.js SDK will be documented in this file. This project adheres to [Semantic Versioning](http://semver.org).
 
+## [5.3.1] - 2018-08-27
+### Fixed:
+- Calling `allFlagsState()` did not work if you omitted the optional second parameter, `options`, but did provide a `callback`. ([#114](https://github.com/launchdarkly/node-client/issues/114))
+
 ## [5.3.0] - 2018-08-27
 ### Added:
 - The new `LDClient` method `allFlagsState()` should be used instead of `allFlags()` if you are passing flag data to the front end for use with the JavaScript SDK. It preserves some flag metadata that the front end requires in order to send analytics events correctly. Versions 2.5.0 and above of the JavaScript SDK are able to use this metadata, but the output of `allFlagsState()` will still work with older versions.
diff --git a/index.js b/index.js
index 7cb2044..d70f12b 100644
--- a/index.js
+++ b/index.js
@@ -242,7 +242,12 @@ var newClient = function(sdkKey, config) {
   }
 
   client.allFlagsState = function(user, options, callback) {
-    options = options || {};
+    if (callback === undefined && typeof(options) === 'function') {
+      callback = options;
+      options = {};
+    } else {
+      options = options || {};
+    }
     return wrapPromiseCallback(new Promise(function(resolve, reject) {
       sanitizeUser(user);
       
diff --git a/package-lock.json b/package-lock.json
index 14e8e9b..db4b1e6 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "ldclient-node",
-  "version": "5.3.0",
+  "version": "5.3.1",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
@@ -77,7 +77,7 @@
     "acorn-globals": {
       "version": "4.1.0",
       "resolved": "https://registry.npmjs.org/acorn-globals/-/acorn-globals-4.1.0.tgz",
-      "integrity": "sha512-KjZwU26uG3u6eZcfGbTULzFcsoz6pegNKtHPksZPOUsiKo5bUmiBPa38FuHZ/Eun+XYh/JCCkS9AS3Lu4McQOQ==",
+      "integrity": "sha1-q3FgJdvhfFTT74HTLs4rLZn+JTg=",
       "dev": true,
       "requires": {
         "acorn": "^5.0.0"
@@ -120,7 +120,7 @@
     "ansi-styles": {
       "version": "3.2.1",
       "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-3.2.1.tgz",
-      "integrity": "sha512-VT0ZI6kZRdTh8YyJw3SMbYm/u+NqfsAxEpWO0Pf9sq8/e94WxxOpPKx9FR1FlyCtOVDNOQ+8ntlqFxiRc+r5qA==",
+      "integrity": "sha1-QfuyAkPlCxK+DwS43tvwdSDOhB0=",
       "dev": true,
       "requires": {
         "color-convert": "^1.9.0"
@@ -129,7 +129,7 @@
     "anymatch": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/anymatch/-/anymatch-2.0.0.tgz",
-      "integrity": "sha512-5teOsQWABXHHBFP9y3skS5P3d/WfWXpv3FUpy+LorMrNYaT9pI4oLMQX7jzQ2KklNpGpWHzdCXTDT2Y3XGlZBw==",
+      "integrity": "sha1-vLJLTzeTTZqnrBe0ra+J58du8us=",
       "dev": true,
       "requires": {
         "micromatch": "^3.1.4",
@@ -253,7 +253,7 @@
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               "version": "0.1.6",
               "resolved": "https://registry.npmjs.org/is-descriptor/-/is-descriptor-0.1.6.tgz",
-              "integrity": "sha512-avDYr0SB3DwO9zsMov0gKCESFYqCnE4hq/4z3TdUlukEy5t9C0YRq7HLrsN52NAcqXKaepeCD0n+B0arnVG3Hg==",
+              "integrity": "sha1-Nm2CQN3kh8pRgjsaufB6EKeCUco=",
               "dev": true,
               "requires": {
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@@ -264,7 +264,7 @@
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               "resolved": "https://registry.npmjs.org/kind-of/-/kind-of-5.1.0.tgz",
-              "integrity": "sha512-NGEErnH6F2vUuXDh+OlbcKW7/wOcfdRHaZ7VWtqCztfHri/++YKmP51OdWeGPuqCOba6kk2OTe5d02VmTB80Pw==",
+              "integrity": "sha1-cpyR4thXt6QZofmqZWhcTDP1hF0=",
               "dev": true
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@@ -272,7 +272,7 @@
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           "resolved": "https://registry.npmjs.org/extglob/-/extglob-2.0.4.tgz",
-          "integrity": "sha512-Nmb6QXkELsuBr24CJSkilo6UHHgbekK5UiZgfE6UHD3Eb27YC6oD+bhcT+tJ6cl8dmsgdQxnWlcry8ksBIBLpw==",
+          "integrity": "sha1-rQD+TcYSqSMuhxhxHcXLWrAoVUM=",
           "dev": true,
           "requires": {
             "array-unique": "^0.3.2",
@@ -386,13 +386,13 @@
         "kind-of": {
           "version": "6.0.2",
           "resolved": "https://registry.npmjs.org/kind-of/-/kind-of-6.0.2.tgz",
-          "integrity": "sha512-s5kLOcnH0XqDO+FvuaLX8DDjZ18CGFk7VygH40QoKPUQhW4e2rvM0rwUq0t8IQDOwYSeLK01U90OjzBTme2QqA==",
+          "integrity": "sha1-ARRrNqYhjmTljzqNZt5df8b20FE=",
           "dev": true
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+          "integrity": "sha1-cIWbyVyYQJUvNZoGij/En57PrCM=",
           "dev": true,
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             "arr-diff": "^4.0.0",
@@ -424,7 +424,7 @@
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+      "integrity": "sha1-vNZ5HqWuCXJeF+WtmIE0zUCz2RE=",
       "dev": true,
       "requires": {
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@@ -442,7 +442,7 @@
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+      "integrity": "sha1-NgSLv/TntH4TZkQxbJlmnqWukfE=",
       "dev": true
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@@ -497,7 +497,7 @@
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+      "integrity": "sha1-bIw/uCfdQ+45GPJ7gngqt2WKb9k=",
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@@ -511,7 +511,7 @@
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-      "integrity": "sha512-jp/uFnooOiO+L211eZOoSyzpOITMXx1rBITauYykG3BRYPu8h0UcxsPNB04RR5vo4Tyz3+ay17tR6JVf9qzYWg==",
+      "integrity": "sha1-ePrtjD0HSrgfIrTphdeehzj3IPg=",
       "dev": true
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@@ -576,7 +576,7 @@
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-      "integrity": "sha512-HyfwY6ApZj7BYTcJURpM5tznulaBvyio7/0d4zFOeMPUmfxkCjHocCuoLa2SAGzBI8AREcH3eP3758F672DppA==",
+      "integrity": "sha1-GERAjTuPDTWkBOp6wYDwh6YBvZA=",
       "dev": true,
       "requires": {
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@@ -670,7 +670,7 @@
         "source-map-support": {
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           "resolved": "https://registry.npmjs.org/source-map-support/-/source-map-support-0.4.18.tgz",
-          "integrity": "sha512-try0/JqxPLF9nOjvSta7tVondkP5dwgyLDjVoyMDlmjugT2lRZ1OfsrYTkCd2hkDnJTKRbO/Rl3orm8vlsUzbA==",
+          "integrity": "sha1-Aoam3ovkJkEzhZTpfM6nXwosWF8=",
           "dev": true,
           "requires": {
             "source-map": "^0.5.6"
@@ -733,7 +733,7 @@
     "babylon": {
       "version": "6.18.0",
       "resolved": "https://registry.npmjs.org/babylon/-/babylon-6.18.0.tgz",
-      "integrity": "sha512-q/UEjfGJ2Cm3oKV71DJz9d25TPnq5rhBVL2Q4fA5wcC3jcrdn7+SssEybFIxwAvvP+YCsCYNKughoF33GxgycQ==",
+      "integrity": "sha1-ry87iPpvXB5MY00aD46sT1WzleM=",
       "dev": true
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@@ -745,7 +745,7 @@
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-      "integrity": "sha512-5T6P4xPgpp0YDFvSWwEZ4NoE3aM4QBQXDzmVbraCkFj8zHM+mba8SyqB5DbZWyR7mYHo6Y7BdQo3MoA4m0TeQg==",
+      "integrity": "sha1-e95c7RRbbVUakNuH+DxVi060io8=",
       "dev": true,
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@@ -821,7 +821,7 @@
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       "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.11.tgz",
-      "integrity": "sha512-iCuPHDFgrHX7H2vEI/5xpz07zSHB00TpugqhmYtVmMO6518mCuRMoOYFldEBl0g187ufozdaHgWKcYFb61qGiA==",
+      "integrity": "sha1-PH/L9SnYcibz0vUrlm/1Jx60Qd0=",
       "dev": true,
       "requires": {
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@@ -878,7 +878,7 @@
     "cache-base": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/cache-base/-/cache-base-1.0.1.tgz",
-      "integrity": "sha512-AKcdTnFSWATd5/GCPRxr2ChwIJ85CeyrEyjRHlKxQ56d4XJMGym0uAiKn0xbLOGOl3+yRpOTi484dVCEc5AUzQ==",
+      "integrity": "sha1-Cn9GQWgxyLZi7jb+TnxZ129marI=",
       "dev": true,
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@@ -1003,7 +1003,7 @@
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       "version": "0.3.6",
       "resolved": "https://registry.npmjs.org/class-utils/-/class-utils-0.3.6.tgz",
-      "integrity": "sha512-qOhPa/Fj7s6TY8H8esGu5QNpMMQxz79h+urzrNYN6mn+9BnxlDGf5QZ+XeCDsxSjPqsSR56XOZOJmpeurnLMeg==",
+      "integrity": "sha1-+TNprouafOAv1B+q0MqDAzGQxGM=",
       "dev": true,
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@@ -1211,7 +1211,7 @@
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       "resolved": "https://registry.npmjs.org/debug/-/debug-2.6.9.tgz",
-      "integrity": "sha512-bC7ElrdJaJnPbAP+1EotYvqZsb3ecl5wi6Bfi6BJTUcNowp6cvspg0jXznRTKDjm/E7AdgFBVeAPVMNcKGsHMA==",
+      "integrity": "sha1-XRKFFd8TT/Mn6QpMk/Tgd6U2NB8=",
       "dev": true,
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@@ -1271,7 +1271,7 @@
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       "dev": true,
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@@ -1344,13 +1344,13 @@
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@@ -1501,7 +1501,7 @@
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@@ -1530,7 +1530,7 @@
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@@ -2207,7 +2207,7 @@
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+      "integrity": "sha1-pWiZ0+o8m6uHS7l3O3xe3pL0iV0=",
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@@ -2278,7 +2278,7 @@
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+      "integrity": "sha1-qjiWs+abSH8X4x7SFD1pqOMMLYo=",
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@@ -2444,7 +2444,7 @@
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       "resolved": "https://registry.npmjs.org/snapdragon/-/snapdragon-0.8.2.tgz",
-      "integrity": "sha512-FtyOnWN/wCHTVXOMwvSv26d+ko5vWlIDD6zoUJ7LW8vh+ZBC8QdljveRP+crNrtBwioEUWy/4dMtbBjA4ioNlg==",
+      "integrity": "sha1-ZJIufFZbDhQgS6GqfWlkJ40lGC0=",
       "dev": true,
       "requires": {
         "base": "^0.11.1",
@@ -5188,7 +5188,7 @@
     "snapdragon-node": {
       "version": "2.1.1",
       "resolved": "https://registry.npmjs.org/snapdragon-node/-/snapdragon-node-2.1.1.tgz",
-      "integrity": "sha512-O27l4xaMYt/RSQ5TR3vpWCAB5Kb/czIcqUFOM/C4fYcLnbZUc1PkjTAMjof2pBWaSTwOUd6qUHcFGVGj7aIwnw==",
+      "integrity": "sha1-bBdfhv8UvbByRWPo88GwIaKGhTs=",
       "dev": true,
       "requires": {
         "define-property": "^1.0.0",
@@ -5251,7 +5251,7 @@
     "snapdragon-util": {
       "version": "3.0.1",
       "resolved": "https://registry.npmjs.org/snapdragon-util/-/snapdragon-util-3.0.1.tgz",
-      "integrity": "sha512-mbKkMdQKsjX4BAL4bRYTj21edOf8cN7XHdYUJEe+Zn99hVEYcMvKPct1IqNe7+AZPirn8BCDOQBHQZknqmKlZQ==",
+      "integrity": "sha1-+VZHlIbyrNeXAGk/b3uAXkWrVuI=",
       "dev": true,
       "requires": {
         "kind-of": "^3.2.0"
@@ -5289,7 +5289,7 @@
         "source-map": {
           "version": "0.6.1",
           "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.6.1.tgz",
-          "integrity": "sha512-UjgapumWlbMhkBgzT7Ykc5YXUT46F0iKu8SGXq0bcwP5dz/h0Plj6enJqjz1Zbq2l5WaqYnrVbwWOWMyF3F47g==",
+          "integrity": "sha1-dHIq8y6WFOnCh6jQu95IteLxomM=",
           "dev": true
         }
       }
@@ -5303,7 +5303,7 @@
     "spdx-correct": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/spdx-correct/-/spdx-correct-3.0.0.tgz",
-      "integrity": "sha512-N19o9z5cEyc8yQQPukRCZ9EUmb4HUpnrmaL/fxS2pBo2jbfcFRVuFZ/oFC+vZz0MNNk0h80iMn5/S6qGZOL5+g==",
+      "integrity": "sha1-BaW01xU6GVvJLDxCW2nzsqlSTII=",
       "dev": true,
       "requires": {
         "spdx-expression-parse": "^3.0.0",
@@ -5313,13 +5313,13 @@
     "spdx-exceptions": {
       "version": "2.1.0",
       "resolved": "https://registry.npmjs.org/spdx-exceptions/-/spdx-exceptions-2.1.0.tgz",
-      "integrity": "sha512-4K1NsmrlCU1JJgUrtgEeTVyfx8VaYea9J9LvARxhbHtVtohPs/gFGG5yy49beySjlIMhhXZ4QqujIZEfS4l6Cg==",
+      "integrity": "sha1-LHrmEFbHFKW5ubKyr30xHvXHj+k=",
       "dev": true
     },
     "spdx-expression-parse": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/spdx-expression-parse/-/spdx-expression-parse-3.0.0.tgz",
-      "integrity": "sha512-Yg6D3XpRD4kkOmTpdgbUiEJFKghJH03fiC1OPll5h/0sO6neh2jqRDVHOQ4o/LMea0tgCkbMgea5ip/e+MkWyg==",
+      "integrity": "sha1-meEZt6XaAOBUkcn6M4t5BII7QdA=",
       "dev": true,
       "requires": {
         "spdx-exceptions": "^2.1.0",
@@ -5329,13 +5329,13 @@
     "spdx-license-ids": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/spdx-license-ids/-/spdx-license-ids-3.0.0.tgz",
-      "integrity": "sha512-2+EPwgbnmOIl8HjGBXXMd9NAu02vLjOO1nWw4kmeRDFyHn+M/ETfHxQUK0oXg8ctgVnl9t3rosNVsZ1jG61nDA==",
+      "integrity": "sha1-enzShHDMbToc/m1miG9rxDDTrIc=",
       "dev": true
     },
     "split-string": {
       "version": "3.1.0",
       "resolved": "https://registry.npmjs.org/split-string/-/split-string-3.1.0.tgz",
-      "integrity": "sha512-NzNVhJDYpwceVVii8/Hu6DKfD2G+NrQHlS/V/qgv763EYudVwEcMQNxd2lh+0VrUByXN/oJkl5grOhYWvQUYiw==",
+      "integrity": "sha1-fLCd2jqGWFcFxks5pkZgOGguj+I=",
       "dev": true,
       "requires": {
         "extend-shallow": "^3.0.0"
@@ -5404,7 +5404,7 @@
     "string-width": {
       "version": "2.1.1",
       "resolved": "https://registry.npmjs.org/string-width/-/string-width-2.1.1.tgz",
-      "integrity": "sha512-nOqH59deCq9SRHlxq1Aw85Jnt4w6KvLKqWVik6oA9ZklXLNIOlqg4F2yrT1MVaTjAqvVwdfeZ7w7aCvJD7ugkw==",
+      "integrity": "sha1-q5Pyeo3BPSjKyBXEYhQ6bZASrp4=",
       "dev": true,
       "requires": {
         "is-fullwidth-code-point": "^2.0.0",
@@ -5467,7 +5467,7 @@
     "test-exclude": {
       "version": "4.2.1",
       "resolved": "https://registry.npmjs.org/test-exclude/-/test-exclude-4.2.1.tgz",
-      "integrity": "sha512-qpqlP/8Zl+sosLxBcVKl9vYy26T9NPalxSzzCP/OY6K7j938ui2oKgo+kRZYfxAeIpLqpbVnsHq1tyV70E4lWQ==",
+      "integrity": "sha1-36Ii8DSAvKaSB8pyizfXS0X3JPo=",
       "dev": true,
       "requires": {
         "arrify": "^1.0.1",
@@ -5594,7 +5594,7 @@
             "is-descriptor": {
               "version": "0.1.6",
               "resolved": "https://registry.npmjs.org/is-descriptor/-/is-descriptor-0.1.6.tgz",
-              "integrity": "sha512-avDYr0SB3DwO9zsMov0gKCESFYqCnE4hq/4z3TdUlukEy5t9C0YRq7HLrsN52NAcqXKaepeCD0n+B0arnVG3Hg==",
+              "integrity": "sha1-Nm2CQN3kh8pRgjsaufB6EKeCUco=",
               "dev": true,
               "requires": {
                 "is-accessor-descriptor": "^0.1.6",
@@ -5605,7 +5605,7 @@
             "kind-of": {
               "version": "5.1.0",
               "resolved": "https://registry.npmjs.org/kind-of/-/kind-of-5.1.0.tgz",
-              "integrity": "sha512-NGEErnH6F2vUuXDh+OlbcKW7/wOcfdRHaZ7VWtqCztfHri/++YKmP51OdWeGPuqCOba6kk2OTe5d02VmTB80Pw==",
+              "integrity": "sha1-cpyR4thXt6QZofmqZWhcTDP1hF0=",
               "dev": true
             }
           }
@@ -5613,7 +5613,7 @@
         "extglob": {
           "version": "2.0.4",
           "resolved": "https://registry.npmjs.org/extglob/-/extglob-2.0.4.tgz",
-          "integrity": "sha512-Nmb6QXkELsuBr24CJSkilo6UHHgbekK5UiZgfE6UHD3Eb27YC6oD+bhcT+tJ6cl8dmsgdQxnWlcry8ksBIBLpw==",
+          "integrity": "sha1-rQD+TcYSqSMuhxhxHcXLWrAoVUM=",
           "dev": true,
           "requires": {
             "array-unique": "^0.3.2",
@@ -5727,13 +5727,13 @@
         "kind-of": {
           "version": "6.0.2",
           "resolved": "https://registry.npmjs.org/kind-of/-/kind-of-6.0.2.tgz",
-          "integrity": "sha512-s5kLOcnH0XqDO+FvuaLX8DDjZ18CGFk7VygH40QoKPUQhW4e2rvM0rwUq0t8IQDOwYSeLK01U90OjzBTme2QqA==",
+          "integrity": "sha1-ARRrNqYhjmTljzqNZt5df8b20FE=",
           "dev": true
         },
         "micromatch": {
           "version": "3.1.10",
           "resolved": "https://registry.npmjs.org/micromatch/-/micromatch-3.1.10.tgz",
-          "integrity": "sha512-MWikgl9n9M3w+bpsY3He8L+w9eF9338xRl8IAO5viDizwSzziFEyUzo2xrrloB64ADbTf8uA8vRqqttDTOmccg==",
+          "integrity": "sha1-cIWbyVyYQJUvNZoGij/En57PrCM=",
           "dev": true,
           "requires": {
             "arr-diff": "^4.0.0",
@@ -5783,7 +5783,7 @@
     "to-regex": {
       "version": "3.0.2",
       "resolved": "https://registry.npmjs.org/to-regex/-/to-regex-3.0.2.tgz",
-      "integrity": "sha512-FWtleNAtZ/Ki2qtqej2CXTOayOH9bHDQF+Q48VpWyDXjbYxA4Yz8iDB31zXOBUlOHHKidDbqGVrTUvQMPmBGBw==",
+      "integrity": "sha1-E8/dmzNlUvMLUfM6iuG0Knp1mc4=",
       "dev": true,
       "requires": {
         "define-property": "^2.0.2",
@@ -5998,7 +5998,7 @@
     "util.promisify": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/util.promisify/-/util.promisify-1.0.0.tgz",
-      "integrity": "sha512-i+6qA2MPhvoKLuxnJNpXAGhg7HphQOSUq2LKMZD0m15EiskXUkMvKdF4Uui0WYeCUGea+o2cw/ZuwehtfsrNkA==",
+      "integrity": "sha1-RA9xZaRZyaFtwUXrjnLzVocJcDA=",
       "dev": true,
       "requires": {
         "define-properties": "^1.1.2",
@@ -6069,7 +6069,7 @@
     "webidl-conversions": {
       "version": "4.0.2",
       "resolved": "https://registry.npmjs.org/webidl-conversions/-/webidl-conversions-4.0.2.tgz",
-      "integrity": "sha512-YQ+BmxuTgd6UXZW3+ICGfyqRyHXVlD5GtQr5+qjiNW7bF0cqrzX500HVXPBOvgXb5YnzDd+h0zqyv61KUD7+Sg==",
+      "integrity": "sha1-qFWYCx8LazWbodXZ+zmulB+qY60=",
       "dev": true
     },
     "whatwg-encoding": {
@@ -6196,7 +6196,7 @@
     "write-file-atomic": {
       "version": "2.3.0",
       "resolved": "https://registry.npmjs.org/write-file-atomic/-/write-file-atomic-2.3.0.tgz",
-      "integrity": "sha512-xuPeK4OdjWqtfi59ylvVL0Yn35SF3zgcAcv7rBPFHVaEapaDr4GdGgm3j7ckTwH9wHL7fGmgfAnb0+THrHb8tA==",
+      "integrity": "sha1-H/YVdcLipOjlENb6TiQ8zhg5mas=",
       "dev": true,
       "requires": {
         "graceful-fs": "^4.1.11",
@@ -6222,7 +6222,7 @@
     "xml-name-validator": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/xml-name-validator/-/xml-name-validator-3.0.0.tgz",
-      "integrity": "sha512-A5CUptxDsvxKJEU3yO6DuWBSJz/qizqzJKOMIfUJHETbBw/sFaDxgd6fxm1ewUaM0jZ444Fc5vC5ROYurg/4Pw==",
+      "integrity": "sha1-auc+Bt5NjG5H+fsYH3jWSK1FfGo=",
       "dev": true
     },
     "y18n": {
@@ -6252,7 +6252,7 @@
     "yargs-parser": {
       "version": "8.1.0",
       "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-8.1.0.tgz",
-      "integrity": "sha512-yP+6QqN8BmrgW2ggLtTbdrOyBNSI7zBa4IykmiV5R1wl1JWNxQvWhMfMdmzIYtKU7oP3OOInY/tl2ov3BDjnJQ==",
+      "integrity": "sha1-8TdqM7Ziml0GN4KUTacyYx6WaVA=",
       "dev": true,
       "requires": {
         "camelcase": "^4.1.0"
diff --git a/package.json b/package.json
index d7eb180..2ac8809 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "ldclient-node",
-  "version": "5.3.0",
+  "version": "5.3.1",
   "description": "LaunchDarkly SDK for Node.js",
   "main": "index.js",
   "scripts": {
diff --git a/test/LDClient-test.js b/test/LDClient-test.js
index bb132a7..e297e45 100644
--- a/test/LDClient-test.js
+++ b/test/LDClient-test.js
@@ -333,6 +333,20 @@ describe('LDClient', function() {
     });
   });
 
+  it('can omit options parameter for allFlagsState()', function(done) {
+    var flag = { key: 'key', on: false, offVariation: 0, variations: ['value'] };
+    var client = createOnlineClientWithFlags({ 'key': flag });
+    var user = { key: 'user' };
+    client.on('ready', function() {
+      client.allFlagsState(user, function(err, state) {
+        expect(err).toBeNull();
+        expect(state.valid).toEqual(true);
+        expect(state.allValues()).toEqual({ 'key': 'value' });
+        done();
+      });
+    });
+  });
+
   it('should not overflow the call stack when evaluating a huge number of flags', function(done) {
     var flagCount = 5000;
     var flags = {};