diff --git a/mRemoteV1/App/NativeMethods.cs b/mRemoteV1/App/NativeMethods.cs
index f5425fa81..264cde74a 100644
--- a/mRemoteV1/App/NativeMethods.cs
+++ b/mRemoteV1/App/NativeMethods.cs
@@ -47,10 +47,10 @@ namespace mRemoteNG.App
         internal static extern IntPtr SendMessage(IntPtr hWnd, uint Msg, IntPtr wParam, StringBuilder lParam);
 
         [DllImport("user32.dll", CharSet = CharSet.Unicode)]
-        public static extern IntPtr SendMessage(IntPtr hWnd, uint msg, IntPtr wParam, string lParam);
+        internal static extern IntPtr SendMessage(IntPtr hWnd, uint msg, IntPtr wParam, string lParam);
 
         [DllImport("user32.dll", CharSet = CharSet.Unicode)]
-        public static extern IntPtr SendMessage([In] IntPtr hWnd, [In] uint msg, [Out] StringBuilder wParam, [In] IntPtr lParam);
+        internal static extern IntPtr SendMessage([In] IntPtr hWnd, [In] uint msg, [Out] StringBuilder wParam, [In] IntPtr lParam);
 
         [DllImport("user32.dll", SetLastError = true, CharSet = CharSet.Unicode)]
         internal static extern IntPtr SetClipboardViewer(IntPtr hWndNewViewer);