diff --git a/tracker/dmlc_tracker/local.py b/tracker/dmlc_tracker/local.py
index dff7c17..fca0f9d 100644
--- a/tracker/dmlc_tracker/local.py
+++ b/tracker/dmlc_tracker/local.py
@@ -24,6 +24,13 @@ def exec_cmd(cmd, role, taskid, pass_env):
 
     num_retry = env.get('DMLC_NUM_ATTEMPT', 0)
 
+    cmd_str = ''
+    for k, v in env.items():
+        if str(k)[0:4] == 'DMLC':
+            strenv = str(k) + '=' + str(v);
+            cmd_str = cmd_str + ' ' + strenv
+    cmd = cmd + cmd_str
+
     while True:
         if os.name == 'nt':
             ret = subprocess.call(cmd, shell=True, env=env)