diff --git a/korganizer/korgac/alarmdialog.cpp b/korganizer/korgac/alarmdialog.cpp
index cc0bb283..b38e6a79 100644
--- a/korganizer/korgac/alarmdialog.cpp
+++ b/korganizer/korgac/alarmdialog.cpp
@@ -544,7 +544,21 @@ void AlarmDialog::wakeUp()
   }
 
   if ( activeReminders )
+  {
+    DCOPRef screensaver("kdesktop", "KScreensaverIface");
+    DCOPReply reply = screensaver.call("isBlanked");
+    bool res = true;
+    if (reply.isValid()) {
+      reply.get(res);
+    }
     show();
+    if (res)
+    {
+      // Lower the dialog if the screensaver is active or its status unknown.
+      // This prevents reminders to show on a locked screen.
+      lower();
+    }
+  }
   setTimer();
   showDetails();
   emit reminderCount( activeCount() );