diff --git a/src/eddymotion/model/base.py b/src/eddymotion/model/base.py
index fe8aca40..5191024d 100644
--- a/src/eddymotion/model/base.py
+++ b/src/eddymotion/model/base.py
@@ -90,7 +90,7 @@ class BaseModel:
         "_models",
         "_datashape",
     )
-    _modelargs = tuple()
+    _modelargs = ()
 
     def __init__(self, gtab, S0=None, mask=None, b_max=None, **kwargs):
         """Base initialization."""