diff --git a/lib/sinon/mock-expectation.js b/lib/sinon/mock-expectation.js
index 05603de22..ece7fa6a1 100644
--- a/lib/sinon/mock-expectation.js
+++ b/lib/sinon/mock-expectation.js
@@ -182,7 +182,7 @@ var mockExpectation = {
                 mockExpectation.fail(this.method + " received wrong arguments " + format(args) +
                     ", expected " + format(expectedArguments));
             }
-        });
+        }, this);
     },
 
     allowsCall: function allowsCall(thisValue, args) {