diff --git a/xpinstall/Makefile.in b/xpinstall/Makefile.in
index d4c76673c55d..e8f9fc415a15 100644
--- a/xpinstall/Makefile.in
+++ b/xpinstall/Makefile.in
@@ -32,7 +32,7 @@ include $(DEPTH)/config/autoconf.mk
 
 DIRS		= public res src stub
 
-ifeq (,$(filter Linux SunOS5,$(OS_ARCH)))
+ifneq (,$(filter Linux SunOS5,$(OS_ARCH)))
 ifdef MOZ_ENABLE_GTK
 DIRS		+= wizard/unix/src2
 endif