diff --git a/Source/OpenTK/Platform/MacOS/AglContext.cs b/Source/OpenTK/Platform/MacOS/AglContext.cs
index 65bdd0af..d1de6664 100644
--- a/Source/OpenTK/Platform/MacOS/AglContext.cs
+++ b/Source/OpenTK/Platform/MacOS/AglContext.cs
@@ -464,64 +464,16 @@ namespace OpenTK.Platform.MacOS
 
         #region IGraphicsContextInternal Members
 
-        private const string Library = "libdl.dylib";
-
-        [DllImport(Library, EntryPoint = "NSIsSymbolNameDefined")]
-        private static extern bool NSIsSymbolNameDefined(string s);
-        [DllImport(Library, EntryPoint = "NSIsSymbolNameDefined")]
-        private static extern bool NSIsSymbolNameDefined(IntPtr s);
-        [DllImport(Library, EntryPoint = "NSLookupAndBindSymbol")]
-        private static extern IntPtr NSLookupAndBindSymbol(string s);
-        [DllImport(Library, EntryPoint = "NSLookupAndBindSymbol")]
-        private static extern IntPtr NSLookupAndBindSymbol(IntPtr s);
-        [DllImport(Library, EntryPoint = "NSAddressOfSymbol")]
-        private static extern IntPtr NSAddressOfSymbol(IntPtr symbol);
-
         public override IntPtr GetAddress(string function)
         {
-            // Instead of allocating and combining strings in managed memory
-            // we do that directly in unmanaged memory. This way, we avoid
-            // 2 string allocations every time this function is called.
-
-            // must add a '_' prefix and null-terminate the function name,
-            // hence we allocate +2 bytes
-            IntPtr ptr = Marshal.AllocHGlobal(function.Length + 2);
-            try
-            {
-                Marshal.WriteByte(ptr, (byte)'_');
-                for (int i = 0; i < function.Length; i++)
-                {
-                    Marshal.WriteByte(ptr, i + 1, (byte)function[i]);
-                }
-                Marshal.WriteByte(ptr, function.Length + 1, 0); // null-terminate
-
-                IntPtr symbol = IntPtr.Zero;
-                if (NSIsSymbolNameDefined(ptr))
-                {
-                    symbol = NSLookupAndBindSymbol(ptr);
-                    if (symbol != IntPtr.Zero)
-                        symbol = NSAddressOfSymbol(symbol);
-                }
-                return symbol;
-            }
-            finally
-            {
-                Marshal.FreeHGlobal(ptr);
-            }
+            return NS.GetAddress(function);
         }
 
         public override IntPtr GetAddress(IntPtr function)
         {
-            if (!NSIsSymbolNameDefined(function))
-                return IntPtr.Zero;
-
-            IntPtr symbol = NSLookupAndBindSymbol(function);
-            if (symbol != IntPtr.Zero)
-                symbol = NSAddressOfSymbol(symbol);
-
-            return symbol;
+            return NS.GetAddress(function);
         }
-        
+
         #endregion
     }
 }
diff --git a/Source/OpenTK/Platform/MacOS/NS.cs b/Source/OpenTK/Platform/MacOS/NS.cs
new file mode 100644
index 00000000..945a7e25
--- /dev/null
+++ b/Source/OpenTK/Platform/MacOS/NS.cs
@@ -0,0 +1,92 @@
+#region License
+//
+// NS.cs
+//
+// Author:
+//       Stefanos A. <stapostol@gmail.com>
+//
+// Copyright (c) 2006-2013 Stefanos Apostolopoulos
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+//
+
+#endregion
+
+using System;
+using System.Runtime.InteropServices;
+
+namespace OpenTK.Platform.MacOS
+{
+
+    internal class NS
+    {
+        const string Library = "libdl.dylib";
+
+        [DllImport(Library, EntryPoint = "NSIsSymbolNameDefined")]
+        static extern bool NSIsSymbolNameDefined(string s);
+        [DllImport(Library, EntryPoint = "NSIsSymbolNameDefined")]
+        static extern bool NSIsSymbolNameDefined(IntPtr s);
+        [DllImport(Library, EntryPoint = "NSLookupAndBindSymbol")]
+        static extern IntPtr NSLookupAndBindSymbol(string s);
+        [DllImport(Library, EntryPoint = "NSLookupAndBindSymbol")]
+        static extern IntPtr NSLookupAndBindSymbol(IntPtr s);
+        [DllImport(Library, EntryPoint = "NSAddressOfSymbol")]
+        static extern IntPtr NSAddressOfSymbol(IntPtr symbol);
+
+        public static IntPtr GetAddress(string function)
+        {
+            // Instead of allocating and combining strings in managed memory
+            // we do that directly in unmanaged memory. This way, we avoid
+            // 2 string allocations every time this function is called.
+
+            // must add a '_' prefix and null-terminate the function name,
+            // hence we allocate +2 bytes
+            IntPtr ptr = Marshal.AllocHGlobal(function.Length + 2);
+            try
+            {
+                Marshal.WriteByte(ptr, (byte)'_');
+                for (int i = 0; i < function.Length; i++)
+                {
+                    Marshal.WriteByte(ptr, i + 1, (byte)function[i]);
+                }
+                Marshal.WriteByte(ptr, function.Length + 1, 0); // null-terminate
+
+                IntPtr symbol = GetAddress(ptr);
+                return symbol;
+            }
+            finally
+            {
+                Marshal.FreeHGlobal(ptr);
+            }
+        }
+
+        public static IntPtr GetAddress(IntPtr function)
+        {
+            IntPtr symbol = IntPtr.Zero;
+            if (NSIsSymbolNameDefined(function))
+            {
+                symbol = NSLookupAndBindSymbol(function);
+                if (symbol != IntPtr.Zero)
+                    symbol = NSAddressOfSymbol(symbol);
+            }
+            return symbol;
+        }
+    }
+}
+