1 files changed, 1 insertions, 1 deletions
diff --git a/commit.h b/commit.h
index 442e50ff24..acabb05785 100644
--- a/commit.h
+++ b/commit.h
@@ -181,7 +181,7 @@ struct commit_list *commit_list_insert_by_date(struct commit *item,
 void commit_list_sort_by_date(struct commit_list **list);
 
 /* Shallow copy of the input list */
-struct commit_list *copy_commit_list(struct commit_list *list);
+struct commit_list *copy_commit_list(const struct commit_list *list);
 
 /* Modify list in-place to reverse it, returning new head; list will be tail */
 struct commit_list *reverse_commit_list(struct commit_list *list);