diff --git a/src/browser/eventPlugins/__tests__/EnterLeaveEventPlugin-test.js b/src/browser/eventPlugins/__tests__/EnterLeaveEventPlugin-test.js
index dd61e4b1ad..24d64f8e1c 100644
--- a/src/browser/eventPlugins/__tests__/EnterLeaveEventPlugin-test.js
+++ b/src/browser/eventPlugins/__tests__/EnterLeaveEventPlugin-test.js
@@ -46,9 +46,10 @@ describe('EnterLeaveEventPlugin', function() {
 
     var iframeDocument = iframe.contentDocument;
 
-    if (!iframeDocument.innerHTML) {
-      iframeDocument.innerHTML = '<html><head></head><body></body></html>';
-    }
+    iframeDocument.write(
+      '<!DOCTYPE html><html><head></head><body></body></html>'
+    );
+    iframeDocument.close();
 
     var component = React.renderComponent(<div />, iframeDocument.body);
     var div = component.getDOMNode();
