diff --git a/data/ui/window.ui b/data/ui/window.ui
index 07b88418..19b995e8 100644
--- a/data/ui/window.ui
+++ b/data/ui/window.ui
@@ -343,6 +343,7 @@
   <object class="GcalSourceDialog" id="source_dialog">
     <property name="visible">False</property>
     <property name="transient_for">GcalWindow</property>
+    <signal name="delete-event" handler="gtk_widget_hide_on_delete" object="GcalWindow" swapped="no" />
   </object>
   <object class="GcalEditDialog" id="edit_dialog">
     <property name="visible">False</property>