diff --git a/CPF.Linux/X11Window.cs b/CPF.Linux/X11Window.cs
index 195c17f..4938b05 100644
--- a/CPF.Linux/X11Window.cs
+++ b/CPF.Linux/X11Window.cs
@@ -1532,11 +1532,12 @@ namespace CPF.Linux
             var data = new UIntPtr[_width * _height + 2];
             data[0] = new UIntPtr((uint)_width);
             data[1] = new UIntPtr((uint)_height);
+            var offset = 2;
             for (var y = 0; y < _height; y++)
             {
                 var r = y * _width;
                 for (var x = 0; x < _width; x++)
-                    data[r + x] = new UIntPtr(_bdata[r + x]);
+                    data[r + x + offset] = new UIntPtr(_bdata[r + x]);
             }
 
             fixed (void* pdata = data)