diff --git a/mozilla/toolkit/toolkit-tiers.mk b/mozilla/toolkit/toolkit-tiers.mk
index 7c1e966acd6..521604b0856 100644
--- a/mozilla/toolkit/toolkit-tiers.mk
+++ b/mozilla/toolkit/toolkit-tiers.mk
@@ -106,7 +106,7 @@ ifdef MOZ_STORAGE
 tier_gecko_dirs += storage
 endif
 
-ifdef MOZ_XUL
+ifdef MOZ_RDF
 tier_gecko_dirs += rdf
 endif