diff --git a/notes.h b/notes.h
index ee65bd1a2430d4af53f03fd2cc9faa916863408c..9f59277c516f7ac78bcc66f91a7d7013b2a77f65 100644
--- a/notes.h
+++ b/notes.h
@@ -212,7 +212,7 @@ void format_note(struct notes_tree *t, const unsigned char *object_sha1,
 struct string_list;
 
 struct display_notes_opt {
-	int suppress_default_notes:1;
+	unsigned int suppress_default_notes:1;
 	struct string_list *extra_notes_refs;
 };