diff --git a/parl/remote/job.py b/parl/remote/job.py
index 483c631b1bb1a2e5bab07be53e53eab27957c3f7..794496ddffe53a119cbc0e6312c19daa0d913db3 100644
--- a/parl/remote/job.py
+++ b/parl/remote/job.py
@@ -364,7 +364,7 @@ class Job(object):
         try:
             # receive source code from the actor and append them to the environment variables.
             envdir = self.wait_for_files(reply_socket, job_address)
-            sys.path.append(envdir)
+            sys.path.insert(0, envdir)
             os.chdir(envdir)
 
             obj = self.wait_for_connection(reply_socket)