diff --git a/src/calibre/gui2/preferences/look_feel.ui b/src/calibre/gui2/preferences/look_feel.ui
index 7cd45beba0..f83dde019a 100644
--- a/src/calibre/gui2/preferences/look_feel.ui
+++ b/src/calibre/gui2/preferences/look_feel.ui
@@ -217,7 +217,7 @@
           <string> px</string>
          </property>
          <property name="minimum">
-          <number>-15</number>
+          <number>-20</number>
          </property>
         </widget>
        </item>