diff --git a/data/ui/edit-dialog.ui b/data/ui/edit-dialog.ui
index ec597f9e..8135a57b 100644
--- a/data/ui/edit-dialog.ui
+++ b/data/ui/edit-dialog.ui
@@ -36,6 +36,8 @@
             <property name="can_focus">True</property>
             <property name="receives_default">True</property>
             <property name="popover">sources_popover</property>
+            <property name="sensitive" bind-source="GcalEditDialog" bind-property="writable" bind-flags="default" />
+            <property name="tooltip-text" translatable="yes">Click to select the event's agenda</property>
             <style>
               <class name="flat"/>
               <class name="sources-button"/>