diff --git a/bin/csh/Makefile b/bin/csh/Makefile
index 121b40d02fbd..e5d4ec197d7e 100644
--- a/bin/csh/Makefile
+++ b/bin/csh/Makefile
@@ -12,6 +12,7 @@ TCSHDIR= ${.CURDIR}/../../contrib/tcsh
 PROG=	csh
 DFLAGS= -D_PATH_TCSHELL='"/bin/${PROG}"'
 CFLAGS+= -I. -I${.CURDIR} -I${TCSHDIR} ${DFLAGS}
+WARNS=	1
 SRCS=	sh.c sh.dir.c sh.dol.c sh.err.c sh.exec.c sh.char.c \
 	sh.exp.c sh.file.c sh.func.c sh.glob.c sh.hist.c sh.init.c \
 	sh.lex.c sh.misc.c sh.parse.c sh.print.c sh.proc.c sh.sem.c \