diff --git a/mozilla/widget/tests/scribble/Makefile.in b/mozilla/widget/tests/scribble/Makefile.in
index 9fa7e7db103..a1a0b85e53b 100644
--- a/mozilla/widget/tests/scribble/Makefile.in
+++ b/mozilla/widget/tests/scribble/Makefile.in
@@ -98,6 +98,7 @@ LIBS := \
 	$(NULL)
 
 CFLAGS += $(TOOLKIT_CFLAGS)
+CXXFLAGS += $(TOOLKIT_CXXFLAGS)
 
 include $(topsrcdir)/config/rules.mk