1 files changed, 2 insertions, 1 deletions
diff --git a/hex.c b/hex.c
index ab2610e..845b01a 100644
--- a/hex.c
+++ b/hex.c
@@ -78,7 +78,8 @@ char *sha1_to_hex(const unsigned char *sha1)
 {
 	static int bufno;
 	static char hexbuffer[4][GIT_SHA1_HEXSZ + 1];
-	return sha1_to_hex_r(hexbuffer[3 & ++bufno], sha1);
+	bufno = (bufno + 1) % ARRAY_SIZE(hexbuffer);
+	return sha1_to_hex_r(hexbuffer[bufno], sha1);
 }
 
 char *oid_to_hex(const struct object_id *oid)