diff --git a/kdesktop/lock/main.cc b/kdesktop/lock/main.cc
index c1b1da2f0..a79f6924f 100644
--- a/kdesktop/lock/main.cc
+++ b/kdesktop/lock/main.cc
@@ -325,7 +325,7 @@ int main( int argc, char **argv )
 #endif
         }
 
-        TDELockFile lock(locateLocal("tmp", "kdesktop_lock_lockfile"));
+        TDELockFile lock(locateLocal("tmp", TQString("kdesktop_lock_lockfile.%1").arg(getenv("DISPLAY"))));
         lock.setStaleTime(0);
         TDELockFile::LockResult lockRet = lock.lock();
         if (lockRet != TDELockFile::LockOK) {