diff --git a/window_ui.ui b/window_ui.ui
index 649e932..6103334 100644
--- a/window_ui.ui
+++ b/window_ui.ui
@@ -4,8 +4,8 @@
   <object class="GtkApplicationWindow" id="main_window">
     <property name="default-height">500</property>
     <property name="default-width">720</property>
-    <property name="child">
-      <object class="GtkBox" id="main_box">
+    <child>
+      <object class="GtkBox">
         <property name="orientation">vertical</property>
         <child>
           <object class="GtkBox">
@@ -579,6 +579,6 @@
           </object>
         </child>
       </object>
-    </property>
+    </child>
   </object>
 </interface>