diff --git a/share/qtcreator/qmldesigner/propertyEditorQmlSources/imports/StudioControls/TopLevelComboBox.qml b/share/qtcreator/qmldesigner/propertyEditorQmlSources/imports/StudioControls/TopLevelComboBox.qml
index 3ee49b56ad8..7b03ac97724 100644
--- a/share/qtcreator/qmldesigner/propertyEditorQmlSources/imports/StudioControls/TopLevelComboBox.qml
+++ b/share/qtcreator/qmldesigner/propertyEditorQmlSources/imports/StudioControls/TopLevelComboBox.qml
@@ -122,7 +122,8 @@ T.ComboBox {
         }
 
         Rectangle {
-            anchors.fill: parent
+            width: window.width
+            height: window.height
             color: control.style.popup.background
         }
     }