diff --git a/upload-pack.c b/upload-pack.c
index 30146a04f7a271ffaa033c0c6567ad1036f4bc49..b058e8de506baca9719b1ae13dd8c2a8a0dbcf14 100644
--- a/upload-pack.c
+++ b/upload-pack.c
@@ -596,7 +596,7 @@ static void receive_needs(void)
 		if (!prefixcmp(line, "shallow ")) {
 			unsigned char sha1[20];
 			struct object *object;
-			if (get_sha1(line + 8, sha1))
+			if (get_sha1_hex(line + 8, sha1))
 				die("invalid shallow line: %s", line);
 			object = parse_object(sha1);
 			if (!object)