diff --git a/components/layout/Sider.tsx b/components/layout/Sider.tsx
index 39b39935a3..63e52295d3 100644
--- a/components/layout/Sider.tsx
+++ b/components/layout/Sider.tsx
@@ -147,7 +147,7 @@ export default defineComponent({
         width,
         reverseArrow,
         zeroWidthTriggerStyle,
-        trigger,
+        trigger = slots.trigger?.(),
         collapsible,
         theme,
       } = props;