diff --git a/src/plugins/texteditor/generichighlighter/managedefinitionsdialog.ui b/src/plugins/texteditor/generichighlighter/managedefinitionsdialog.ui
index d6db77b0335..351d38c2752 100644
--- a/src/plugins/texteditor/generichighlighter/managedefinitionsdialog.ui
+++ b/src/plugins/texteditor/generichighlighter/managedefinitionsdialog.ui
@@ -34,6 +34,12 @@
         <property name="selectionBehavior">
          <enum>QAbstractItemView::SelectRows</enum>
         </property>
+        <property name="showGrid">
+         <bool>false</bool>
+        </property>
+        <property name="gridStyle">
+         <enum>Qt::NoPen</enum>
+        </property>
         <property name="columnCount">
          <number>3</number>
         </property>