diff --git a/test/backbone.html b/test/backbone.html
index 13d283975..462c0e50d 100644
--- a/test/backbone.html
+++ b/test/backbone.html
@@ -33,13 +33,6 @@
 				'debounce': lodash.debounce,
 				'defer': lodash.defer
 			});
-			if (!_.chain) {
-				_.mixin({
-					'chain': function(value) {
-						return new _(value);
-					}
-				});
-			}
 		</script>
 		<script src="../vendor/backbone/backbone.js"></script>
 		<script src="../vendor/backbone/test/environment.js"></script>
diff --git a/test/underscore.html b/test/underscore.html
index e93f26d98..5fd8e650b 100644
--- a/test/underscore.html
+++ b/test/underscore.html
@@ -34,7 +34,7 @@
 				    push = arrayProto.push,
 				    slice = arrayProto.slice;
 
-				if (_.chain) {
+				if (_.chain().__chain__) {
 					return;
 				}
 				_.mixin = function(object) {