diff --git a/lib/x11/ext/render.js b/lib/x11/ext/render.js
index cfe6914..5a580e5 100644
--- a/lib/x11/ext/render.js
+++ b/lib/x11/ext/render.js
@@ -378,7 +378,8 @@ exports.requireExt = function(display, callback)
                         ext.mono1 = f[0] ;
                     if (f[2] == 24 && f[3] == 16 && f[5] == 8 && f[7] == 0)
                         ext.rgb24 = f[0];
-                    if (f[2] == 32 && f[3] == 16 && f[5] == 8 && f[7] == 0 && f[9] == 24)
+                    // 1, 32, 16, 255, 8, 255, 0, 255, 24, 255, 0
+                    if (f[2] == 32 && f[3] == 16 && f[4] == 255 && f[5] == 8 && f[6] == 255 && f[7] == 0 && f[9] == 24)
                         ext.rgba32 = f[0] ;
                 }
                 callback(ext);