diff --git a/montepython/MultiNest.py b/montepython/MultiNest.py
index a8da3696..06730065 100644
--- a/montepython/MultiNest.py
+++ b/montepython/MultiNest.py
@@ -95,7 +95,7 @@
     }
 # Automatically-defined arguments of PyMultiNest, type specified
 NS_auto_arguments = {
-    'base_dir': {'type': str}
+    'base_dir': {'type': str},
     'n_dims':   {'type': int},
     'n_params': {'type': int},
     'verbose':  {'type': str2bool},