diff --git a/notes.h b/notes.h
index ee65bd1a24..9f59277c51 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;
 };