diff --git a/gluefactory/train.py b/gluefactory/train.py
index 60712f13..12ad2075 100644
--- a/gluefactory/train.py
+++ b/gluefactory/train.py
@@ -53,7 +53,7 @@
         "exp_div_10": 0,
         "on_epoch": False,
         "factor": 1.0,
-        "options": None,  # add lr_scheduler arguments here
+        "options": {},  # add lr_scheduler arguments here
     },
     "lr_scaling": [(100, ["dampingnet.const"])],
     "eval_every_iter": 1000,  # interval for evaluation on the validation set