diff --git a/Source/OpenTK/Platform/Windows/API.cs b/Source/OpenTK/Platform/Windows/API.cs
index e525052c..38a6f2a2 100644
--- a/Source/OpenTK/Platform/Windows/API.cs
+++ b/Source/OpenTK/Platform/Windows/API.cs
@@ -96,8 +96,6 @@ namespace OpenTK.Platform.Windows
 
     internal static class Functions
     {
-        #region --- Functions ---
-
         #region Window functions
 
         #region SetWindowPos
@@ -810,6 +808,9 @@ namespace OpenTK.Platform.Windows
 
         #endregion
 
+        [DllImport("user32.dll")]
+        public static extern bool IsWindowVisisble(IntPtr intPtr);
+
         #endregion
 
         #region Display settings
@@ -1384,8 +1385,6 @@ namespace OpenTK.Platform.Windows
         #endregion
 
         #endregion
-
-        #endregion
     }
 
     #region --- Constants ---