diff --git a/data/ui/source-dialog.ui b/data/ui/source-dialog.ui
index a606dc3c..6ff639ea 100644
--- a/data/ui/source-dialog.ui
+++ b/data/ui/source-dialog.ui
@@ -737,6 +737,7 @@
                                         <property name="visible">True</property>
                                         <property name="can_focus">False</property>
                                         <property name="activate_on_single_click">False</property>
+                                        <property name="selection_mode">none</property>
                                         <style>
                                           <class name="calendar-list" />
                                         </style>