diff --git a/src/widget/singleselect/singleselect.insert.combo.js b/src/widget/singleselect/singleselect.insert.combo.js
index 819859d109..b2d86d913d 100644
--- a/src/widget/singleselect/singleselect.insert.combo.js
+++ b/src/widget/singleselect/singleselect.insert.combo.js
@@ -29,7 +29,7 @@ BI.SingleSelectInsertCombo = BI.inherit(BI.Single, {
 
         this.trigger = BI.createWidget({
             type: "bi.single_select_trigger",
-            height: o.height,
+            height: o.height - 2,
             allowNoSelect: o.allowNoSelect,
             allowEdit: o.allowEdit,
             // adapter: this.popup,