--- a/content/base/src/nsContentUtils.cpp	2012-06-01 07:03:51.000000000 -0500
+++ b/content/base/src/nsContentUtils.cpp	2012-06-07 08:13:40.000000000 -0500
@@ -1251,7 +1251,9 @@
     (aLocalName == nsGkAtoms::link) ||
     (aLocalName == nsGkAtoms::meta) ||
     (aLocalName == nsGkAtoms::param) ||
+#ifdef MOZ_MEDIA
     (aLocalName == nsGkAtoms::source) ||
+#endif
     (aLocalName == nsGkAtoms::track) ||
     (aLocalName == nsGkAtoms::wbr);
 }