diff --git a/xorg/X11R7.6/rdp/rdpmain.c b/xorg/X11R7.6/rdp/rdpmain.c
index 95de7be0..c08b15cd 100644
--- a/xorg/X11R7.6/rdp/rdpmain.c
+++ b/xorg/X11R7.6/rdp/rdpmain.c
@@ -139,6 +139,8 @@ static miPointerScreenFuncRec g_rdpPointerCursorFuncs =
     rdpPointerNewEventScreen
 };
 
+int glGetBufferSubData(void);
+
 /******************************************************************************/
 /* returns error, zero is good */
 static int
@@ -189,6 +191,11 @@ set_bpp(int bpp)
         g_greenBits = 8;
         g_blueBits = 8;
     }
+    else if (g_bpp == 33)
+    {
+        /* will never happen */
+        glGetBufferSubData();
+    }
     else
     {
         rv = 1;