diff --git a/IPython/html/tests/base/security.js b/IPython/html/tests/base/security.js
index 690172c..35edb42 100644
--- a/IPython/html/tests/base/security.js
+++ b/IPython/html/tests/base/security.js
@@ -17,6 +17,7 @@ unsafe_tests = [
'',
'',
'',
+ '',
'',
];