diff --git a/sw/qa/tiledrendering/tiledrendering.cxx b/sw/qa/tiledrendering/tiledrendering.cxx
index cb9f46f3dc6b..6f6e6e150c63 100644
--- a/sw/qa/tiledrendering/tiledrendering.cxx
+++ b/sw/qa/tiledrendering/tiledrendering.cxx
@@ -105,7 +105,7 @@ public:
     }
 };
 
-IMPL_LINK ( TiledRenderingDialog,  RenderHdl, Button *, EMPTYARG )
+IMPL_LINK ( TiledRenderingDialog, RenderHdl, Button *, EMPTYARG )
 {
     int contextWidth = extractInt(mpContextWidth);
     int contextHeight = extractInt(mpContextHeight);
@@ -133,6 +133,9 @@ IMPL_LINK ( TiledRenderingDialog,  RenderHdl, Button *, EMPTYARG )
         // copy the aDevice content to mpImage
         BitmapEx aBitmap(aDevice.GetBitmapEx(Point(0,0), aDevice.GetOutputSizePixel()));
         mpImage->SetImage(Image(aBitmap));
+
+        // update the dialog size
+        setOptimalLayoutSize();
     }
 
     return 1;
diff --git a/sw/qa/tiledrendering/tiledrendering.ui b/sw/qa/tiledrendering/tiledrendering.ui
index 59dc1e6fe200..e5e6d8ff420c 100644
--- a/sw/qa/tiledrendering/tiledrendering.ui
+++ b/sw/qa/tiledrendering/tiledrendering.ui
@@ -15,11 +15,11 @@
   </object>
   <object class="GtkWindow" id="TiledRendering">
     <property name="can_focus">False</property>
+    <property name="border_width">12</property>
     <child>
       <object class="GtkBox" id="box1">
         <property name="visible">True</property>
         <property name="can_focus">False</property>
-        <property name="border_width">12</property>
         <property name="spacing">12</property>
         <child>
           <object class="GtkBox" id="box7">