diff --git a/usr.sbin/rmt/rmt.c b/usr.sbin/rmt/rmt.c
index c3e36150e349..5315208362de 100644
--- a/usr.sbin/rmt/rmt.c
+++ b/usr.sbin/rmt/rmt.c
@@ -130,7 +130,7 @@ main(argc, argv)
 		getstring(count);
 		getstring(pos);
 		DEBUG2("rmtd: L %s %s\n", count, pos);
-		rval = lseek(tape, (off_t)atol(count), atoi(pos));
+		rval = lseek(tape, (off_t)strtoll(count, NULL, 10), atoi(pos));
 		if (rval < 0)
 			goto ioerror;
 		goto respond;