diff -NurpP mmv-1.01b.orig//mmv.c mmv-1.01b.fixed//mmv.c
--- mmv-1.01b.orig//mmv.c	2011-04-24 23:03:23.000000000 +0000
+++ mmv-1.01b.fixed//mmv.c	2011-04-24 23:02:47.000000000 +0000
@@ -2825,7 +2825,7 @@ static int getreply(m, failact)
 	static FILE *tty = NULL;
 	int c, r;
 
-	fprintf(stderr, m);
+	fprintf(stderr, "%s", m);
 	if (tty == NULL && (tty = fopen(TTY, "r")) == NULL) {
 		fprintf(stderr, "Can not open %s to get reply.\n", TTY);
 		if (failact == -1)