diff --git a/bin/cat/Makefile b/bin/cat/Makefile
index cce69d8aad9e..06bb071363f8 100644
--- a/bin/cat/Makefile
+++ b/bin/cat/Makefile
@@ -1,26 +1,28 @@
 #	@(#)Makefile	8.1 (Berkeley) 5/31/93
 # $FreeBSD$
 
 .include <src.opts.mk>
 
 PACKAGE=runtime
 PROG=	cat
 
 .ifdef BOOTSTRAPPING
 # For the bootstrap cat we disable all wide char support to allow building
 # on Linux/macOS
 CFLAGS+=-DBOOTSTRAP_CAT
 .endif
 
 HAS_TESTS=
 SUBDIR.${MK_TESTS}+= tests
 
 # Temporary disable building cat with Casper.
 #.if ${MK_CASPER} != "no" && !defined(RESCUE) && !defined(BOOTSTRAPPING)
 #LIBADD+=        casper
 #LIBADD+=        cap_fileargs
 #LIBADD+=        cap_net
 #CFLAGS+=-DWITH_CASPER
 #.endif
+# Depend on Makefile to rebiuld when WITH_CASPER changes
+cat.o:	Makefile
 
 .include <bsd.prog.mk>