diff --git a/src/gui/gcal-window.ui b/src/gui/gcal-window.ui
index daf1009b..9f4483b7 100644
--- a/src/gui/gcal-window.ui
+++ b/src/gui/gcal-window.ui
@@ -164,7 +164,7 @@
           </packing>
         </child>
         <child>
-          <object class="GtkHeaderBar" id="header_bar">
+          <object class="HdyHeaderBar" id="header_bar">
             <property name="visible">True</property>
             <property name="show_close_button">True</property>
             <property name="title" translatable="yes">Calendar</property>