diff --git a/kcm/src/stylepreview.ui b/kcm/src/stylepreview.ui
--- a/kcm/src/stylepreview.ui
+++ b/kcm/src/stylepreview.ui
@@ -14,7 +14,7 @@
      <property name="currentIndex">
       <number>0</number>
      </property>
-     <widget class="QWidget" name="tab">
+     <widget class="QWidget" name="tab1">
       <attribute name="title">
        <string>Tab 1</string>
       </attribute>
@@ -150,7 +150,7 @@
        </item>
       </layout>
      </widget>
-     <widget class="QWidget" name="tab">
+     <widget class="QWidget" name="tab2">
       <attribute name="title">
        <string>Tab 2</string>
       </attribute>