diff --git a/Source/OpenTK/Platform/Windows/API.cs b/Source/OpenTK/Platform/Windows/API.cs
index 38a6f2a2..e2b011ed 100644
--- a/Source/OpenTK/Platform/Windows/API.cs
+++ b/Source/OpenTK/Platform/Windows/API.cs
@@ -809,7 +809,7 @@ namespace OpenTK.Platform.Windows
         #endregion
 
         [DllImport("user32.dll")]
-        public static extern bool IsWindowVisisble(IntPtr intPtr);
+        public static extern bool IsWindowVisible(IntPtr intPtr);
 
         #endregion
 
diff --git a/Source/OpenTK/Platform/Windows/WinGLNative.cs b/Source/OpenTK/Platform/Windows/WinGLNative.cs
index 9b61e17d..6f33039d 100644
--- a/Source/OpenTK/Platform/Windows/WinGLNative.cs
+++ b/Source/OpenTK/Platform/Windows/WinGLNative.cs
@@ -718,7 +718,7 @@ namespace OpenTK.Platform.Windows
         {
             get
             {
-                return Functions.IsWindowVisisble(window.WindowHandle);
+                return Functions.IsWindowVisible(window.WindowHandle);
             }
             set
             {