diff --git a/bin/mv/mv.c b/bin/mv/mv.c
--- a/bin/mv/mv.c
+++ b/bin/mv/mv.c
@@ -265,7 +265,8 @@
 	static u_int blen = MAXPHYS;
 	static char *bp = NULL;
 	mode_t oldmode;
-	int nread, from_fd, to_fd;
+	ssize_t nread;
+	int from_fd, to_fd;
 	struct stat tsb;
 
 	if ((from_fd = open(from, O_RDONLY, 0)) < 0) {