diff --git a/rdf/tests/rdfcat/Makefile.in b/rdf/tests/rdfcat/Makefile.in
index 6f507d8b20fe..63fd5d2f567b 100644
--- a/rdf/tests/rdfcat/Makefile.in
+++ b/rdf/tests/rdfcat/Makefile.in
@@ -38,3 +38,4 @@ LIBS		= \
 
 include $(topsrcdir)/config/rules.mk
 
+CXXFLAGS += $(MOZ_TOOLKIT_REGISTRY_CFLAGS)