diff --git a/gtk/ui/gtksidebarrow.ui b/gtk/ui/gtksidebarrow.ui
index ca497673f3..291e4f082e 100644
--- a/gtk/ui/gtksidebarrow.ui
+++ b/gtk/ui/gtksidebarrow.ui
@@ -76,7 +76,7 @@
   </template>
   <!-- We need it to not make the row smaller when the eject button is hidden -->
   <object class="GtkSizeGroup">
-    <property name="mode">GTK_SIZE_GROUP_VERTICAL</property>
+    <property name="mode">vertical</property>
     <widgets>
       <widget name="eject_button"/>
       <widget name="label_widget"/>