diff --git a/data/ui/source-dialog.ui b/data/ui/source-dialog.ui
index abc35ffc..328ac51f 100644
--- a/data/ui/source-dialog.ui
+++ b/data/ui/source-dialog.ui
@@ -16,6 +16,7 @@
     <child internal-child="vbox">
       <object class="GtkBox" id="vbox">
         <property name="orientation">vertical</property>
+        <property name="border_width">0</property>
         <child internal-child="action_area">
           <object class="GtkButtonBox" id="dialog-action_area1">
           </object>