diff --git a/src/calibre/gui2/convert/page_setup.ui b/src/calibre/gui2/convert/page_setup.ui
index a2cb9cfc10..e3b759a81a 100644
--- a/src/calibre/gui2/convert/page_setup.ui
+++ b/src/calibre/gui2/convert/page_setup.ui
@@ -96,7 +96,10 @@
        <property name="title">
         <string>Margins</string>
        </property>
-       <layout class="QGridLayout" name="gridLayout">
+       <layout class="QFormLayout" name="formLayout">
+        <property name="fieldGrowthPolicy">
+         <enum>QFormLayout::FieldsStayAtSizeHint</enum>
+        </property>
         <item row="0" column="0">
          <widget class="QLabel" name="label_3">
           <property name="text">