diff --git a/spec/support/phantomjs_ext/disable_js_fx.js b/spec/support/phantomjs_ext/disable_js_fx.js
index 2b97f0a0f..eae828ac8 100644
--- a/spec/support/phantomjs_ext/disable_js_fx.js
+++ b/spec/support/phantomjs_ext/disable_js_fx.js
@@ -1,3 +1,5 @@
 document.addEventListener("DOMContentLoaded", function() {
-  $.fx.off = true;
+  if (typeof $ !== 'undefined') {
+    $.fx.off = true;
+  }
 });