diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index 17fb327..2f1b886 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -6,7 +6,7 @@ History
 0.13.1 (unreleased)
 -------------------
 
-- No changes yet
+- `BinaryCarrier` now fulfills the API contract that binary carrier objects have a `buffer` property.
 
 
 0.13.0 (2016-10-14)
diff --git a/lib-debug/binary_carrier.js b/lib-debug/binary_carrier.js
index 733762c..8923ffc 100644
--- a/lib-debug/binary_carrier.js
+++ b/lib-debug/binary_carrier.js
@@ -15,7 +15,7 @@ function _classCallCheck(instance, Constructor) { if (!(instance instanceof Cons
 var BinaryCarrier = function BinaryCarrier(binaryData) {
     _classCallCheck(this, BinaryCarrier);
 
-    this._buffer = binaryData;
+    this.buffer = binaryData;
 };
 
 exports.default = BinaryCarrier;
diff --git a/lib-debug/binary_carrier.js.map b/lib-debug/binary_carrier.js.map
index 59440c2..877aabc 100644
--- a/lib-debug/binary_carrier.js.map
+++ b/lib-debug/binary_carrier.js.map
@@ -1 +1 @@
-{"version":3,"sources":["../src/binary_carrier.js"],"names":[],"mappings":";;;;;;;;AAAA;;;;;;IAMqB,a,GACjB,uBAAY,UAAZ,EAAwB;AAAA;;AACpB,SAAK,OAAL,GAAe,UAAf;AACH,C;;kBAHgB,a","file":"binary_carrier.js","sourcesContent":["/**\n * Convenience class to use as a binary carrier.\n *\n * Any valid Object with a field named `buffer` may be used as a binary carrier;\n * this class is only one such type of object that can be used.\n */\nexport default class BinaryCarrier {\n    constructor(binaryData) {\n        this._buffer = binaryData;\n    }\n}\n"]}
\ No newline at end of file
+{"version":3,"sources":["../src/binary_carrier.js"],"names":[],"mappings":";;;;;;;;AAAA;;;;;;IAMqB,a,GACjB,uBAAY,UAAZ,EAAwB;AAAA;;AACpB,SAAK,MAAL,GAAc,UAAd;AACH,C;;kBAHgB,a","file":"binary_carrier.js","sourcesContent":["/**\n * Convenience class to use as a binary carrier.\n *\n * Any valid Object with a field named `buffer` may be used as a binary carrier;\n * this class is only one such type of object that can be used.\n */\nexport default class BinaryCarrier {\n    constructor(binaryData) {\n        this.buffer = binaryData;\n    }\n}\n"]}
\ No newline at end of file
diff --git a/lib/binary_carrier.js b/lib/binary_carrier.js
index 733762c..8923ffc 100644
--- a/lib/binary_carrier.js
+++ b/lib/binary_carrier.js
@@ -15,7 +15,7 @@ function _classCallCheck(instance, Constructor) { if (!(instance instanceof Cons
 var BinaryCarrier = function BinaryCarrier(binaryData) {
     _classCallCheck(this, BinaryCarrier);
 
-    this._buffer = binaryData;
+    this.buffer = binaryData;
 };
 
 exports.default = BinaryCarrier;
diff --git a/lib/binary_carrier.js.map b/lib/binary_carrier.js.map
index 59440c2..877aabc 100644
--- a/lib/binary_carrier.js.map
+++ b/lib/binary_carrier.js.map
@@ -1 +1 @@
-{"version":3,"sources":["../src/binary_carrier.js"],"names":[],"mappings":";;;;;;;;AAAA;;;;;;IAMqB,a,GACjB,uBAAY,UAAZ,EAAwB;AAAA;;AACpB,SAAK,OAAL,GAAe,UAAf;AACH,C;;kBAHgB,a","file":"binary_carrier.js","sourcesContent":["/**\n * Convenience class to use as a binary carrier.\n *\n * Any valid Object with a field named `buffer` may be used as a binary carrier;\n * this class is only one such type of object that can be used.\n */\nexport default class BinaryCarrier {\n    constructor(binaryData) {\n        this._buffer = binaryData;\n    }\n}\n"]}
\ No newline at end of file
+{"version":3,"sources":["../src/binary_carrier.js"],"names":[],"mappings":";;;;;;;;AAAA;;;;;;IAMqB,a,GACjB,uBAAY,UAAZ,EAAwB;AAAA;;AACpB,SAAK,MAAL,GAAc,UAAd;AACH,C;;kBAHgB,a","file":"binary_carrier.js","sourcesContent":["/**\n * Convenience class to use as a binary carrier.\n *\n * Any valid Object with a field named `buffer` may be used as a binary carrier;\n * this class is only one such type of object that can be used.\n */\nexport default class BinaryCarrier {\n    constructor(binaryData) {\n        this.buffer = binaryData;\n    }\n}\n"]}
\ No newline at end of file
diff --git a/src/binary_carrier.js b/src/binary_carrier.js
index 1241c38..6aca315 100644
--- a/src/binary_carrier.js
+++ b/src/binary_carrier.js
@@ -6,6 +6,6 @@
  */
 export default class BinaryCarrier {
     constructor(binaryData) {
-        this._buffer = binaryData;
+        this.buffer = binaryData;
     }
 }
diff --git a/test/opentracing_api.js b/test/opentracing_api.js
index 607a4e8..f9b5895 100644
--- a/test/opentracing_api.js
+++ b/test/opentracing_api.js
@@ -66,5 +66,14 @@ module.exports = function opentracingAPITests() {
                 expect(ref).to.be.an('object');
             });
         });
+
+
+        describe('BinaryCarrier', function() {
+            it('should set binary data as a field called "buffer"', function() {
+                var buffer = new Float64Array();
+                var ref = new opentracing.BinaryCarrier(buffer);
+                expect(ref.buffer).to.equal(buffer);
+            });
+        });
     });
 }