diff --git a/package.json b/package.json
index 1de351a..733b85c 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "coinbase-pro-api",
-  "version": "0.1.0",
+  "version": "0.1.1",
   "description": "lightweight coinbase pro api implementation",
   "main": "index.js",
   "config": {
diff --git a/test/client.js b/test/client.js
index cca88a0..9955ae0 100644
--- a/test/client.js
+++ b/test/client.js
@@ -73,6 +73,18 @@ test('coinbase-pro-api/client', () => {
       ok(headers.hasOwnProperty('CB-ACCESS-SIGN'))
       ok(headers.hasOwnProperty('CB-ACCESS-TIMESTAMP'))
     })
+
+    test('evn argument is allowed to be empty', () => {
+      const headers = headersFor({ method: 'get' }, {})
+
+      ok(headers.hasOwnProperty('User-Agent'))
+      ok(headers.hasOwnProperty('Accept'))
+      ok(headers.hasOwnProperty('Content-Type'))
+      ok(headers.hasOwnProperty('CB-ACCESS-KEY'))
+      ok(headers.hasOwnProperty('CB-ACCESS-PASSPHRASE'))
+      ok(headers.hasOwnProperty('CB-ACCESS-SIGN'))
+      ok(headers.hasOwnProperty('CB-ACCESS-TIMESTAMP'))
+    })
   })
 
   test('.toString', () => {