diff --git a/src/test/ReactPerf.js b/src/test/ReactPerf.js
index dbc5c727e9..0f88ba2fa8 100644
--- a/src/test/ReactPerf.js
+++ b/src/test/ReactPerf.js
@@ -56,7 +56,7 @@ var ReactPerf = {
         }
         return func.apply(this, arguments);
       };
-      wrapper.displayName = objName + '.' + fnName;
+      wrapper.displayName = objName + '_' + fnName;
       return wrapper;
     }
     return func;