diff --git a/src/Mod/PartDesign/Gui/TaskHoleParameters.ui b/src/Mod/PartDesign/Gui/TaskHoleParameters.ui
index f8ee6605bf..120862b336 100644
--- a/src/Mod/PartDesign/Gui/TaskHoleParameters.ui
+++ b/src/Mod/PartDesign/Gui/TaskHoleParameters.ui
@@ -67,7 +67,7 @@
        <item>
         <widget class="QComboBox" name="ThreadSize">
          <property name="sizePolicy">
-          <sizepolicy hsizetype="Preferred" vsizetype="Fixed">
+          <sizepolicy hsizetype="Expanding" vsizetype="Fixed">
            <horstretch>0</horstretch>
            <verstretch>0</verstretch>
           </sizepolicy>