diff --git a/gtk/ui/gtkassistant.ui b/gtk/ui/gtkassistant.ui
index 59f83c4aad..a96fa92ca7 100644
--- a/gtk/ui/gtkassistant.ui
+++ b/gtk/ui/gtkassistant.ui
@@ -10,7 +10,7 @@
     <child>
       <object class="GtkBox" id="main_box">
         <property name="visible">True</property>
-        <property name="spacing">12</property>
+        <property name="spacing">0</property>
         <child>
           <object class="GtkFrame" id="sidebar_frame">
             <property name="visible">True</property>
@@ -34,9 +34,9 @@
         <child>
           <object class="GtkBox" id="content_box">
             <property name="visible">True</property>
-            <property name="border_width">12</property>
+            <property name="border_width">0</property>
             <property name="orientation">vertical</property>
-            <property name="spacing">12</property>
+            <property name="spacing">0</property>
             <child>
               <object class="GtkNotebook" id="content">
                 <property name="visible">True</property>