diff --git a/netwerk/protocol/res/nsResProtocolHandler.cpp b/netwerk/protocol/res/nsResProtocolHandler.cpp
index 031143164994..1961c21457e9 100644
--- a/netwerk/protocol/res/nsResProtocolHandler.cpp
+++ b/netwerk/protocol/res/nsResProtocolHandler.cpp
@@ -58,6 +58,8 @@
 #include "nsURLHelper.h"
 #include "nsEscape.h"
 
+#include "mozilla/Omnijar.h"
+
 static NS_DEFINE_CID(kResURLCID, NS_RESURL_CID);
 
 static nsResProtocolHandler *gResHandler = nsnull;