diff --git a/setup.py b/setup.py
index 38a965dc9cd..64172e5394f 100644
--- a/setup.py
+++ b/setup.py
@@ -9,7 +9,7 @@
 extras = {
   'atari': ['atari_py>=0.0.21', 'Pillow', 'PyOpenGL'],
   'board_game' : ['pachi-py>=0.0.19'],
-  'box2d': ['box2d-py'],
+  'box2d': ['Box2D-kengz'],
   'classic_control': ['PyOpenGL'],
   'mujoco': ['mujoco_py>=0.4.3', 'imageio'],
   'parameter_tuning': ['keras', 'theano'],