diff --git a/src/Angular.js b/src/Angular.js
index b84b156f72e4..0ae2f5289097 100644
--- a/src/Angular.js
+++ b/src/Angular.js
@@ -1091,7 +1091,7 @@ function parseKeyValue(/**string*/keyValue) {
       key = tryDecodeURIComponent(key_value[0]);
       if ( isDefined(key) ) {
         var val = isDefined(key_value[1]) ? tryDecodeURIComponent(key_value[1]) : true;
-        if (!obj[key]) {
+        if (!hasOwnProperty.call(obj, key)) {
           obj[key] = val;
         } else if(isArray(obj[key])) {
           obj[key].push(val);
diff --git a/test/AngularSpec.js b/test/AngularSpec.js
index fea74f81212a..6a74c6c615b9 100644
--- a/test/AngularSpec.js
+++ b/test/AngularSpec.js
@@ -480,6 +480,13 @@ describe('angular', function() {
       expect(parseKeyValue('flag1&flag1=value&flag1=value2&flag1')).
       toEqual({flag1: [true,'value','value2',true]});
     });
+
+
+    it('should ignore properties higher in the prototype chain', function() {
+      expect(parseKeyValue('toString=123')).toEqual({
+        'toString': '123'
+      });
+    });
   });
 
   describe('toKeyValue', function() {