diff --git a/baselines/ppo2/model.py b/baselines/ppo2/model.py
index 6b48d97..2ce6344 100644
--- a/baselines/ppo2/model.py
+++ b/baselines/ppo2/model.py
@@ -124,8 +124,9 @@ class Model(object):
 
         if MPI is None or MPI.COMM_WORLD.Get_rank() == 0:
             initialize()
-        global_variables = tf.get_collection(tf.GraphKeys.GLOBAL_VARIABLES, scope="")
-        sync_from_root(sess, global_variables) #pylint: disable=E1101
+        else:
+            global_variables = tf.get_collection(tf.GraphKeys.GLOBAL_VARIABLES, scope="")
+            sync_from_root(sess, global_variables) #pylint: disable=E1101
 
     def train(self, lr, cliprange, obs, returns, masks, actions, values, neglogpacs, states=None):
         # Here we calculate advantage A(s,a) = R + yV(s') - V(s)