diff --git a/log-tree.c b/log-tree.c
index abf5cc31e5d502781c3bcde0c5401cc657d3a30e..01beb11f65b518e382fa01f18f03c5a9f2ddf529 100644
--- a/log-tree.c
+++ b/log-tree.c
@@ -98,14 +98,14 @@ static int add_ref_decoration(const char *refname, const struct object_id *oid,
 	assert(cb_data == NULL);
 
 	if (starts_with(refname, "refs/replace/")) {
-		unsigned char original_sha1[20];
+		struct object_id original_oid;
 		if (!check_replace_refs)
 			return 0;
-		if (get_sha1_hex(refname + 13, original_sha1)) {
+		if (get_oid_hex(refname + 13, &original_oid)) {
 			warning("invalid replace ref %s", refname);
 			return 0;
 		}
-		obj = parse_object(original_sha1);
+		obj = parse_object(original_oid.hash);
 		if (obj)
 			add_name_decoration(DECORATION_GRAFTED, "replaced", obj);
 		return 0;