diff --git a/src/widget/treeview.c b/src/widget/treeview.c
index 3486b14..f74c2b2 100644
--- a/src/widget/treeview.c
+++ b/src/widget/treeview.c
@@ -438,6 +438,8 @@ static void mwTreeViewSetOpenedImpl(MwWidget handle, void* item, int opened) {
 static int mwTreeViewGetOpenedImpl(MwWidget handle, void* item) {
 	MwTreeViewEntry* e = item;
 
+	(void)handle;
+
 	return e->opened;
 }