diff --git a/rev-list.c b/rev-list.c
index c7ebd2f03c..6e6a6dfecd 100644
--- a/rev-list.c
+++ b/rev-list.c
@@ -149,7 +149,7 @@ static int count_distance(struct commit_list *entry)
 	return nr;
 }
 
-static int clear_distance(struct commit_list *list)
+static void clear_distance(struct commit_list *list)
 {
 	while (list) {
 		struct commit *commit = list->item;