diff --git a/source/python/classes/MarsRetrieval.py b/source/python/classes/MarsRetrieval.py
index 20f585fb9d05c972f3520bb79f1d91c766cbab65..cd7acb3ccbd9999f8bc343f19a7ed2c5d2dae706 100644
--- a/source/python/classes/MarsRetrieval.py
+++ b/source/python/classes/MarsRetrieval.py
@@ -513,7 +513,7 @@ class MarsRetrieval(object):
             for key, value in attrs.items():
                 request_str = request_str + ',' + key + '=' + str(value)
             request_str += ',target="' + target + '"'
-            p = subprocess.Popen(['mars', '-p'],
+            p = subprocess.Popen(['mars'],
                                  stdin=subprocess.PIPE,
                                  stdout=subprocess.PIPE,
                                  stderr=subprocess.PIPE,