diff --git a/flatland/envs/agent_utils.py b/flatland/envs/agent_utils.py
index 5105ec5dfb792895a7361060431d84d8ceb5c39e..09d796d4947b840edfa5288df195eda6c7c7e1d2 100644
--- a/flatland/envs/agent_utils.py
+++ b/flatland/envs/agent_utils.py
@@ -31,7 +31,7 @@ class EnvAgentStatic(object):
     target = attrib()
     moving = attrib()
 
-    def __init__(self, position, direction, target):
+    def __init__(self, position, direction, target, moving=False):
         self.position = position
         self.direction = direction
         self.target = target