diff --git a/usr.sbin/pcvt/vgaio/Makefile b/usr.sbin/pcvt/vgaio/Makefile
index e9674dedfb57..53083e052a22 100644
--- a/usr.sbin/pcvt/vgaio/Makefile
+++ b/usr.sbin/pcvt/vgaio/Makefile
@@ -12,7 +12,7 @@ error:
 PROG=	vgaio
 MAN8=	vgaio.${MAN8EXT}
 
-SRCS=	vgaio.y lex.l
+SRCS=	vgaio.c lex.c
 YACC=	yacc
 
 #YFLAGS+= -yd	# Bison
@@ -26,6 +26,7 @@ LDADD=	-lm -ly -ll
 CFLAGS=	-O2	# due to a gcc bug, it compiles only with -O2!
 CFLAGS+= -I${.OBJDIR} -I${.CURDIR}
 
+CLEANFILES+= lex.c lex.yy.c vgaio.c y.tab.[ch]
 CLEANFILES+= y.output	# comment file from bison
 
 install: