fix for issue 439
fix for issue 439

mammadori/pyglet,oktayacikalin/pyglet,mammadori/pyglet,oktayacikalin/pyglet,theblacklion/pyglet,oktayacikalin/pyglet,oktayacikalin/pyglet,theblacklion/pyglet,oktayacikalin/pyglet,mammadori/pyglet,theblacklion/pyglet,mammadori/pyglet,theblacklion/pyglet,theblacklion/pyglet