diff --git a/kdesktop/lock/main.cc b/kdesktop/lock/main.cc
index 871c87a69..f2732345a 100644
--- a/kdesktop/lock/main.cc
+++ b/kdesktop/lock/main.cc
@@ -332,7 +332,7 @@ 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) {