diff --git a/lib/diff.js b/lib/diff.js
index 21ed339c..4f81a262 100644
--- a/lib/diff.js
+++ b/lib/diff.js
@@ -1,6 +1,8 @@
 (function (obj) {
-    obj.DiffProto = function(diffMatchPatch) {
-        var dmp = new diffMatchPatch();
+    'use strict';
+    
+    obj.DiffProto = function(DiffMatchPatch) {
+        var dmp = new DiffMatchPatch();
         
         this.createPatch    = function(oldText, newText) {
             var diff        = dmp.diff_main(oldText, newText),
@@ -12,7 +14,7 @@
       
         this.applyPatch     = function(oldText, patch) {
             var patches     = dmp.patch_fromText(patch),
-                result      = dmp.patch_apply(patches, oldText);
+                result      = dmp.patch_apply(patches, oldText),
                 newText     = result[0];
         
             return newText;