diff --git a/3rdparty/RunGuard.hpp b/3rdparty/RunGuard.hpp
deleted file mode 100644
index 6a38d55..0000000
--- a/3rdparty/RunGuard.hpp
+++ /dev/null
@@ -1,98 +0,0 @@
-#ifndef RUNGUARD_H
-#define RUNGUARD_H
-
-#include <QObject>
-#include <QSharedMemory>
-#include <QSystemSemaphore>
-#include <QCryptographicHash>
-
-class RunGuard {
-public:
-    RunGuard(const QString &key);
-
-    ~RunGuard();
-
-    bool isAnotherRunning(quint64 *data_out);
-
-    bool tryToRun(quint64 *data_in);
-
-    void release();
-
-private:
-    const QString key;
-    const QString memLockKey;
-    const QString sharedmemKey;
-
-    QSharedMemory sharedMem;
-    QSystemSemaphore memLock;
-
-    Q_DISABLE_COPY(RunGuard)
-};
-
-namespace {
-
-    QString generateKeyHash(const QString &key, const QString &salt) {
-        QByteArray data;
-
-        data.append(key.toUtf8());
-        data.append(salt.toUtf8());
-        data = QCryptographicHash::hash(data, QCryptographicHash::Sha1).toHex();
-
-        return data;
-    }
-
-} // namespace
-
-RunGuard::RunGuard(const QString &key)
-    : key(key), memLockKey(generateKeyHash(key, "_memLockKey")), sharedmemKey(generateKeyHash(key, "_sharedmemKey")), sharedMem(sharedmemKey), memLock(memLockKey, 1) {
-    memLock.acquire();
-    {
-        QSharedMemory fix(sharedmemKey); // Fix for *nix: http://habrahabr.ru/post/173281/
-        fix.attach();
-    }
-    memLock.release();
-}
-
-RunGuard::~RunGuard() {
-    release();
-}
-
-bool RunGuard::isAnotherRunning(quint64 *data_out) {
-    if (sharedMem.isAttached())
-        return false;
-
-    memLock.acquire();
-    const bool isRunning = sharedMem.attach();
-    if (isRunning) {
-        if (data_out != nullptr) {
-            memcpy(data_out, sharedMem.data(), sizeof(quint64));
-        }
-        sharedMem.detach();
-    }
-    memLock.release();
-
-    return isRunning;
-}
-
-bool RunGuard::tryToRun(quint64 *data_in) {
-    memLock.acquire();
-    const bool result = sharedMem.create(sizeof(quint64));
-    if (result) memcpy(sharedMem.data(), data_in, sizeof(quint64));
-    memLock.release();
-
-    if (!result) {
-        release();
-        return false;
-    }
-
-    return true;
-}
-
-void RunGuard::release() {
-    memLock.acquire();
-    if (sharedMem.isAttached())
-        sharedMem.detach();
-    memLock.release();
-}
-
-#endif // RUNGUARD_H
diff --git a/include/global/NekoGui_Utils.hpp b/include/global/NekoGui_Utils.hpp
index afb5109..010bab6 100644
--- a/include/global/NekoGui_Utils.hpp
+++ b/include/global/NekoGui_Utils.hpp
@@ -11,10 +11,6 @@
 inline QString software_name = "NekoRay";
 inline QString software_core_name = "Xray";
 
-// Main Functions
-
-inline std::function<void()> MF_release_runguard;
-
 // MainWindow functions
 class QWidget;
 inline QWidget *mainwindow;
diff --git a/src/main.cpp b/src/main.cpp
index 9c43f10..9537283 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -10,7 +10,6 @@
 #include <QThread>
 #include <3rdparty/WinCommander.hpp>
 
-#include "3rdparty/RunGuard.hpp"
 #include "include/global/NekoGui.hpp"
 
 #include "include/ui/mainwindow_interface.h"
@@ -117,30 +116,6 @@ int main(int argc, char* argv[]) {
     DS_cores = new QThread;
     DS_cores->start();
 
-    // RunGuard
-    RunGuard guard("nekoray" + wd.absolutePath());
-    quint64 guard_data_in = GetRandomUint64();
-    quint64 guard_data_out = 0;
-    if (!NekoGui::dataStore->flag_many && !guard.tryToRun(&guard_data_in)) {
-        // Some Good System
-        if (guard.isAnotherRunning(&guard_data_out)) {
-            // Wake up a running instance
-            QLocalSocket socket;
-            socket.connectToServer(LOCAL_SERVER_PREFIX + Int2String(guard_data_out));
-            qDebug() << socket.fullServerName();
-            if (!socket.waitForConnected(500)) {
-                qDebug() << "Failed to wake a running instance.";
-                return 0;
-            }
-            qDebug() << "connected to local server, try to raise another program";
-            return 0;
-        }
-        // Some Bad System
-        QMessageBox::warning(nullptr, "NekoRay", "RunGuard disallow to run, use -many to force start.");
-        return 0;
-    }
-    MF_release_runguard = [&] { guard.release(); };
-
 // icons
     QIcon::setFallbackSearchPaths(QStringList{
         ":/nekoray",
@@ -241,15 +216,30 @@ int main(int argc, char* argv[]) {
     signal(SIGTERM, signal_handler);
     signal(SIGINT, signal_handler);
 
+    // Check if another instance is running
+    QLocalSocket socket;
+    socket.connectToServer(LOCAL_SERVER_PREFIX + wd.absolutePath());
+    if (socket.waitForConnected(500))
+    {
+        qDebug() << "Another instance is running, let's wake it up and quit";
+        socket.write("Wake up!");
+        socket.disconnectFromServer();
+        return 0;
+    }
+
     // QLocalServer
-    QLocalServer server;
-    auto server_name = LOCAL_SERVER_PREFIX + Int2String(guard_data_in);
+    QLocalServer server(qApp);
+    auto server_name = LOCAL_SERVER_PREFIX + wd.absolutePath();
     QLocalServer::removeServer(server_name);
-    server.listen(server_name);
-    QObject::connect(&server, &QLocalServer::newConnection, &a, [&] {
-        auto socket = server.nextPendingConnection();
-        qDebug() << "nextPendingConnection:" << server_name << socket;
-        socket->deleteLater();
+    server.setSocketOptions(QLocalServer::WorldAccessOption);
+    if (!server.listen(server_name)) {
+        qWarning() << "Failed to start QLocalServer! Error:" << server.errorString();
+        return 1;
+    }
+    QObject::connect(&server, &QLocalServer::newConnection, qApp, [&] {
+        auto s = server.nextPendingConnection();
+        qDebug() << "Another instance tried to wake us up on " << server_name << s;
+        s->deleteLater();
         // raise main window
         MW_dialog_message("", "Raise");
     });
diff --git a/src/ui/mainwindow.cpp b/src/ui/mainwindow.cpp
index f8849c3..e0c886b 100644
--- a/src/ui/mainwindow.cpp
+++ b/src/ui/mainwindow.cpp
@@ -606,7 +606,8 @@ void MainWindow::dialog_message_impl(const QString &sender, const QString &info)
     if (info == "RestartProgram") {
         this->exit_reason = 2;
         on_menu_exit_triggered();
-    } else if (info == "Raise") {
+    }
+    if (info == "Raise") {
         ActivateWindow(this);
     }
     if (info == "NeedAdmin") {
@@ -750,7 +751,6 @@ void MainWindow::on_menu_exit_triggered() {
         return;
     }
     //
-    MF_release_runguard();
     if (exit_reason == 1) {
         QDir::setCurrent(QApplication::applicationDirPath());
         QProcess::startDetached("./updater", QStringList{});