diff --git a/kcm/kcm.cpp b/kcm/kcm.cpp
--- a/kcm/kcm.cpp
+++ b/kcm/kcm.cpp
@@ -107,6 +107,8 @@
     }
 
     updateState();
+
+    m_ui->kcfg_Timeout->setEnabled(m_ui->kcfg_Autolock->isChecked());
 }
 
 void ScreenLockerKcm::save()
diff --git a/kcm/kcm.ui b/kcm/kcm.ui
--- a/kcm/kcm.ui
+++ b/kcm/kcm.ui
@@ -43,6 +43,9 @@
          </item>
          <item>
           <widget class="KPluralHandlingSpinBox" name="kcfg_Timeout">
+           <property name="enabled">
+            <bool>false</bool>
+           </property>
            <property name="specialValueText">
             <string notr="true"/>
            </property>