diff --git a/qt-ui/configuredivecomputerdialog.ui b/qt-ui/configuredivecomputerdialog.ui
index 94390e9e7..b8092b3a7 100644
--- a/qt-ui/configuredivecomputerdialog.ui
+++ b/qt-ui/configuredivecomputerdialog.ui
@@ -354,6 +354,9 @@
               <property name="suffix">
                <string>%</string>
               </property>
+              <property name="maximum">
+               <number>255</number>
+              </property>
              </widget>
             </item>
             <item row="3" column="3">
@@ -371,6 +374,9 @@
               <property name="suffix">
                <string>%</string>
               </property>
+              <property name="maximum">
+               <number>255</number>
+              </property>
              </widget>
             </item>
             <item row="4" column="0">