diff --git a/tests/HTMLPurifier/HTMLT/safe-iframe-invalid.htmlt b/tests/HTMLPurifier/HTMLT/safe-iframe-invalid.htmlt
new file mode 100644
index 00000000..5b366da5
--- /dev/null
+++ b/tests/HTMLPurifier/HTMLT/safe-iframe-invalid.htmlt
@@ -0,0 +1,7 @@
+--INI--
+HTML.SafeIframe = true
+--HTML--
+<iframe src="http://www.example.com/"></iframe>
+--EXPECT--
+<iframe></iframe>
+--# vim: et sw=4 sts=4