diff --git a/bin/cat/Makefile b/bin/cat/Makefile
index cce69d8aad9e..06bb071363f8 100644
--- a/bin/cat/Makefile
+++ b/bin/cat/Makefile
@@ -22,5 +22,7 @@ SUBDIR.${MK_TESTS}+= tests
 #LIBADD+=        cap_net
 #CFLAGS+=-DWITH_CASPER
 #.endif
+# Depend on Makefile to rebiuld when WITH_CASPER changes
+cat.o:	Makefile
 
 .include <bsd.prog.mk>