diff --git a/client/windows/Makefile.am b/client/windows/Makefile.am
index e6fc4419..0bd6e42d 100644
--- a/client/windows/Makefile.am
+++ b/client/windows/Makefile.am
@@ -197,7 +197,6 @@ spicec_DEPENDENCIES = redc.res
 
 redc.res: redc.rc
 	$(WINDRES) -J rc -i $< -O coff -o $@
-NULL =
 
 EXTRA_DIST = \
 	atomic_count.h		\