diff --git a/src/Layout-test-utils.js b/src/Layout-test-utils.js
index fce33b01..c60be4c3 100644
--- a/src/Layout-test-utils.js
+++ b/src/Layout-test-utils.js
@@ -91,7 +91,7 @@ var layoutTestUtils = (function() {
       _cachedIframe = iframe;
       return iframe;
     } else {
-      setTimeout(getIframe, 0);
+      setTimeout(getIframe.bind(null, iframe), 0);
     }
   }