diff --git a/util/opt/Makefile b/util/opt/Makefile
index 7d2ff552b..24e402b70 100644
--- a/util/opt/Makefile
+++ b/util/opt/Makefile
@@ -51,6 +51,8 @@ pattern.c:      patterns mktab
 mktab:  mktab.o $(LIBS)
 	cc $(CFLAGS) mktab.o $(LIBS) $(LEXLIB) -o mktab
 
+mktab.o:	scan.c
+
 depend: regglob.c regnoglob.c pattern.c
 	sed '/^#AUTOAUTO/,$$d' Makefile >Makefile.new
 	echo '#AUTOAUTOAUTOAUTOAUTOAUTOAUTOAUTO' >> Makefile.new