diff --git a/examples/dqn.py b/examples/dqn.py
index 90d8130..f9f9646 100644
--- a/examples/dqn.py
+++ b/examples/dqn.py
@@ -42,7 +42,6 @@
 REPLAY_START_SIZE = 5000
 END_EPSILON = 0.1
 STEP_SIZE = 0.00025
-GRAD_MOMENTUM = 0.95
 SQUARED_GRAD_MOMENTUM = 0.95
 MIN_SQUARED_GRAD = 0.01
 GAMMA = 0.99