diff --git a/tools/Makefile b/tools/Makefile
index e8e02801a6be0d76b638cc1fc452d9448c80032e..21cc090570728c6592e923ac6169cb76e49231c8 100644
--- a/tools/Makefile
+++ b/tools/Makefile
@@ -97,6 +97,7 @@ endif
 #
 ifeq ($(HOSTOS),cygwin)
 SFX = .exe
+HOST_CFLAGS += -ansi
 else
 SFX =
 endif