diff --git a/usr.bin/diff/diffreg.c b/usr.bin/diff/diffreg.c
index 1535992a72a..c6b09e756b1 100644
--- a/usr.bin/diff/diffreg.c
+++ b/usr.bin/diff/diffreg.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: diffreg.c,v 1.95 2021/10/24 21:24:16 deraadt Exp $	*/
+/*	$OpenBSD: diffreg.c,v 1.96 2026/04/01 17:47:46 deraadt Exp $	*/
 
 /*
  * Copyright (C) Caldera International Inc.  2001-2002.
@@ -1177,7 +1177,7 @@ static int
 readhash(FILE *f, int flags)
 {
 	int i, t, space;
-	int sum;
+	unsigned int sum;
 
 	sum = 1;
 	space = 0;