diff --git a/data/ui/source-dialog.ui b/data/ui/source-dialog.ui
index 9a8a43e9..84bea988 100644
--- a/data/ui/source-dialog.ui
+++ b/data/ui/source-dialog.ui
@@ -37,6 +37,8 @@
           <object class="GtkStack" id="stack">
             <property name="visible">True</property>
             <property name="can_focus">False</property>
+            <property name="hexpand">True</property>
+            <property name="vexpand">True</property>
             <child>
               <object class="GtkGrid" id="edit_grid">
                 <property name="visible">True</property>
@@ -128,6 +130,8 @@
                 <property name="visible">True</property>
                 <property name="can_focus">True</property>
                 <property name="show_border">False</property>
+                <property name="hexpand">True</property>
+                <property name="vexpand">True</property>
                 <child>
                   <object class="GtkGrid" id="web_source_grid">
                     <property name="visible">True</property>