diff --git a/lib/x11/ext/composite.js b/lib/x11/ext/composite.js
index 545504d..7a41030 100644
--- a/lib/x11/ext/composite.js
+++ b/lib/x11/ext/composite.js
@@ -44,7 +44,6 @@ exports.requireExt = function(display, callback)
         ext.RedirectWindow = function( window, updateType )
         {
             X.seq_num++;
-            console.log("ext.RedirectWindow", X.seq_num);
             X.pack_stream.pack('CCSLCxxx', [ext.majorOpcode, 1, 3, window, updateType]);
             X.pack_stream.flush();
         }
@@ -84,10 +83,10 @@ exports.requireExt = function(display, callback)
             X.pack_stream.flush();
         }
  
-        ext.GetOverlayWindow = function(window)
+        ext.GetOverlayWindow = function(window, callback)
         {
             X.seq_num++;
-            X.pack_stream.pack('CCSL', [ext.majorOpcode, 7, 2]);
+            X.pack_stream.pack('CCSL', [ext.majorOpcode, 7, 2, window]);
             X.replies[X.seq_num] = [
                 function(buf, opt) {
                     var res = buf.unpack('L');