diff --git a/Wox/Helper/WindowIntelopHelper.cs b/Wox/Helper/WindowIntelopHelper.cs
index caf7c2a89c..feccd8f6a4 100644
--- a/Wox/Helper/WindowIntelopHelper.cs
+++ b/Wox/Helper/WindowIntelopHelper.cs
@@ -1,19 +1,36 @@
 using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
+using System.Drawing;
 using System.Runtime.InteropServices;
 using System.Windows;
+using System.Windows.Forms;
+using System.Windows.Interop;
 
 namespace Wox.Helper
 {
     public class WindowIntelopHelper
     {
         private const int GWL_STYLE = -16; //WPF's Message code for Title Bar's Style 
-        private const int GWL_EXSTYLE = -20; //Gets the exstyle of the window
-        private const int WS_EX_TOPMOST = 0x00000008; //Topmost flag
         private const int WS_SYSMENU = 0x80000; //WPF's Message code for System Menu
+        private static IntPtr _hwnd_shell;
+        private static IntPtr _hwnd_desktop;
         
+        //Accessors for shell and desktop handlers
+        //Will set the variables once and then will return them
+        private static IntPtr HWND_SHELL
+        {
+            get
+            {
+                return _hwnd_shell != null ? _hwnd_shell : _hwnd_shell = GetShellWindow();
+            }
+        }
+        private static IntPtr HWND_DESKTOP
+        {
+            get
+            {
+                return _hwnd_desktop != null ? _hwnd_desktop : _hwnd_desktop = GetDesktopWindow();
+            }
+        }
+
         [DllImport("user32.dll", SetLastError = true)]
         private static extern int GetWindowLong(IntPtr hWnd, int nIndex);
 
@@ -23,23 +40,53 @@ namespace Wox.Helper
         [DllImport("user32.dll")]
         private static extern IntPtr GetForegroundWindow();
 
-        /// <summary>
-        ///Checks if the foreground window is TopMost (even Wox)
-        /// </summary>
-        /// <returns></returns>
-        public static bool IsForegroundWindowTopMost()
+        [DllImport("user32.dll")]
+        private static extern IntPtr GetDesktopWindow();
+
+        [DllImport("user32.dll")]
+        private static extern IntPtr GetShellWindow();
+
+        [DllImport("user32.dll", SetLastError = true)]
+        private static extern int GetWindowRect(IntPtr hwnd, out RECT rc);
+
+        public static bool IsWindowFullscreen()
         {
-            return (GetWindowLong(GetForegroundWindow(), GWL_EXSTYLE) & WS_EX_TOPMOST) == WS_EX_TOPMOST;
+            RECT foreWinBounds;
+            Rectangle screenBounds;
+            var hWnd = GetForegroundWindow();
+            if (!hWnd.Equals(IntPtr.Zero))
+            {
+                if (!(hWnd.Equals(HWND_DESKTOP) || hWnd.Equals(HWND_SHELL)))
+                {
+                    GetWindowRect(hWnd, out foreWinBounds);
+                    screenBounds = Screen.FromHandle(hWnd).Bounds;
+                    if ((foreWinBounds.Bottom - foreWinBounds.Top) == screenBounds.Height && (foreWinBounds.Right - foreWinBounds.Left) == screenBounds.Width)
+                    {
+                        return true;
+                    }
+                }
+            }
+
+            return false;
         }
 
         /// <summary>
-        /// disable windows toolbar's control box
-        /// this will also disable system menu with Alt+Space hotkey
+        ///     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;
+            var hwnd = new WindowInteropHelper(win).Handle;
             SetWindowLong(hwnd, GWL_STYLE, GetWindowLong(hwnd, GWL_STYLE) & ~WS_SYSMENU);
         }
+
+        [StructLayout(LayoutKind.Sequential)]
+        public struct RECT
+        {
+            public int Left;
+            public int Top;
+            public int Right;
+            public int Bottom;
+        }
     }
-}
+}
\ No newline at end of file
diff --git a/Wox/MainWindow.xaml.cs b/Wox/MainWindow.xaml.cs
index 01d9f94f79..07a98f0872 100644
--- a/Wox/MainWindow.xaml.cs
+++ b/Wox/MainWindow.xaml.cs
@@ -362,11 +362,11 @@ namespace Wox
         /// <returns></returns>
         private bool ShouldIgnoreHotkeys()
         {
-            
-            if (!IsVisible 
-                && UserSettingStorage.Instance.IgnoreHotkeysOnTopMostFocus
-                && WindowIntelopHelper.IsForegroundWindowTopMost())
-                return true;
+            //double if to omit calling win32 function
+            if (UserSettingStorage.Instance.IgnoreHotkeysOnTopMostFocus)
+                if(WindowIntelopHelper.IsWindowFullscreen())
+                    return true;
+
             return false;
         }