diff --git a/GridWorld/gridWorld.py b/GridWorld/gridWorld.py
index 2c1a135..607a206 100644
--- a/GridWorld/gridWorld.py
+++ b/GridWorld/gridWorld.py
@@ -90,7 +90,7 @@ def __init__(self):
 
     def chooseAction(self):
         # choose action with most expected value
-        mx_nxt_reward = 0
+        mx_nxt_reward = -np.inf
         action = ""
 
         if np.random.uniform(0, 1) <= self.exp_rate: