diff --git a/glchess/data/glchess.ui b/glchess/data/glchess.ui
index d2803ef..94734b9 100644
--- a/glchess/data/glchess.ui
+++ b/glchess/data/glchess.ui
@@ -196,6 +196,9 @@
         </child>
         <child>
           <object class="GtkToolbar" id="toolbar">
+            <style>
+                <class name="primary-toolbar"/>
+            </style>
             <property name="visible">True</property>
             <child>
               <object class="GtkToolButton" id="new_game_button">
