diff --git a/GNUmakefile b/GNUmakefile
index d3729e5..36a8fbf 100644
--- a/GNUmakefile
+++ b/GNUmakefile
@@ -20,7 +20,7 @@ endif
 
 ifeq ($(TARGET),Watcom)
 	IS_WATCOM = 1
-	IS_UNIX = 1
+	IS_WINDOWS = 1
 endif
 
 ### Stuff