diff --git a/Wox/Helper/WindowIntelopHelper.cs b/Wox/Helper/WindowIntelopHelper.cs
new file mode 100644
index 0000000000..2e5179b7b4
--- /dev/null
+++ b/Wox/Helper/WindowIntelopHelper.cs
@@ -0,0 +1,31 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Runtime.InteropServices;
+using System.Windows;
+
+namespace Wox.Helper
+{
+    public class WindowIntelopHelper
+    {
+        private const int GWL_STYLE = -16; //WPF's Message code for Title Bar's Style 
+        private const int WS_SYSMENU = 0x80000; //WPF's Message code for System Menu
+
+        [DllImport("user32.dll", SetLastError = true)]
+        private static extern int GetWindowLong(IntPtr hWnd, int nIndex);
+
+        [DllImport("user32.dll")]
+        private static extern int SetWindowLong(IntPtr hWnd, int nIndex, int dwNewLong);
+
+        /// <summary>
+        /// disable windows toolbar's control box
+        /// this will also disable system menu with Alt+Space hotkey
+        /// </summary>
+        public static void DisableControlBox(Window win)
+        {
+            var hwnd = new System.Windows.Interop.WindowInteropHelper(win).Handle;
+            SetWindowLong(hwnd, GWL_STYLE, GetWindowLong(hwnd, GWL_STYLE) & ~WS_SYSMENU);
+        }
+    }
+}
diff --git a/Wox/MainWindow.xaml.cs b/Wox/MainWindow.xaml.cs
index c11ebf1a44..4256d4920f 100644
--- a/Wox/MainWindow.xaml.cs
+++ b/Wox/MainWindow.xaml.cs
@@ -90,6 +90,8 @@ namespace Wox
             InitProgressbarAnimation();
             //only works for win7+
             //DwmDropShadow.DropShadowToWindow(this);
+
+            WindowIntelopHelper.DisableControlBox(this);
         }
 
         private void CurrentDomain_UnhandledException(object sender, UnhandledExceptionEventArgs e)
diff --git a/Wox/Wox.csproj b/Wox/Wox.csproj
index e2c64949b2..3cefced8cf 100644
--- a/Wox/Wox.csproj
+++ b/Wox/Wox.csproj
@@ -107,6 +107,7 @@
     <Compile Include="Commands\CommandFactory.cs" />
     <Compile Include="Commands\PluginCommand.cs" />
     <Compile Include="Commands\SystemCommand.cs" />
+    <Compile Include="Helper\WindowIntelopHelper.cs" />
     <Compile Include="ProgramSourceSetting.xaml.cs">
       <DependentUpon>ProgramSourceSetting.xaml</DependentUpon>
     </Compile>