diff --git a/rdf/datasource/public/nsILocalStore.h b/rdf/datasource/public/nsILocalStore.h
index f9462d4a54d..fb138a221bd 100644
--- a/rdf/datasource/public/nsILocalStore.h
+++ b/rdf/datasource/public/nsILocalStore.h
@@ -23,6 +23,7 @@
 #ifndef nsILocalStore_h__
 #define nsILocalStore_h__
 
+#include "rdf.h"
 #include "nsISupports.h"
 
 // {DF71C6F1-EC53-11d2-BDCA-000064657374}