diff --git a/src/renderers/dom/client/__tests__/ReactMount-test.js b/src/renderers/dom/client/__tests__/ReactMount-test.js
index 7d00553d998..bd438a30f7f 100644
--- a/src/renderers/dom/client/__tests__/ReactMount-test.js
+++ b/src/renderers/dom/client/__tests__/ReactMount-test.js
@@ -200,7 +200,7 @@ describe('ReactMount', function() {
     });
   }
 
-  it.only('warns when using two copies of React before throwing', function() {
+  it('warns when using two copies of React before throwing', function() {
     require('mock-modules').dumpCache();
     var RD1 = require('ReactDOM');
     require('mock-modules').dumpCache();