diff --git a/src/widget/multilayerselecttree/multilayerselecttree.combo.js b/src/widget/multilayerselecttree/multilayerselecttree.combo.js
index d525575f27..57e2d775e8 100644
--- a/src/widget/multilayerselecttree/multilayerselecttree.combo.js
+++ b/src/widget/multilayerselecttree/multilayerselecttree.combo.js
@@ -85,7 +85,8 @@ BI.MultiLayerSelectTreeCombo = BI.inherit(BI.Widget, {
                     }]
                 },
                 value: o.value,
-                maxHeight: 400
+                maxHeight: 400,
+                minHeight: 240
             }
         };
     },
diff --git a/src/widget/multilayersingletree/multilayersingletree.combo.js b/src/widget/multilayersingletree/multilayersingletree.combo.js
index bd13e4de66..8ce263dd8b 100644
--- a/src/widget/multilayersingletree/multilayersingletree.combo.js
+++ b/src/widget/multilayersingletree/multilayersingletree.combo.js
@@ -88,7 +88,8 @@ BI.MultiLayerSingleTreeCombo = BI.inherit(BI.Widget, {
                     }]
                 },
                 value: o.value,
-                maxHeight: 400
+                maxHeight: 400,
+                minHeight: 240
             }
         };
     },