1 files changed, 1 insertions, 1 deletions
diff --git a/commit.h b/commit.h
index 4127c298cb..6d857f06c1 100644
--- a/commit.h
+++ b/commit.h
@@ -249,7 +249,7 @@ typedef int (*each_commit_graft_fn)(const struct commit_graft *, void *);
 
 struct commit_graft *read_graft_line(char *buf, int len);
 int register_commit_graft(struct commit_graft *, int);
-struct commit_graft *lookup_commit_graft(const unsigned char *sha1);
+struct commit_graft *lookup_commit_graft(const struct object_id *oid);
 
 extern struct commit_list *get_merge_bases(struct commit *rev1, struct commit *rev2);
 extern struct commit_list *get_merge_bases_many(struct commit *one, int n, struct commit **twos);