diff --git a/avalanche/training/templates/base.py b/avalanche/training/templates/base.py
index 80b47f325..d58bae600 100644
--- a/avalanche/training/templates/base.py
+++ b/avalanche/training/templates/base.py
@@ -148,9 +148,9 @@ def train(
         self.model.to(self.device)
 
         # Normalize training and eval data.
-        experiences_list: Iterable[TExperienceType] = (
-            _experiences_parameter_as_iterable(experiences)
-        )
+        experiences_list: Iterable[
+            TExperienceType
+        ] = _experiences_parameter_as_iterable(experiences)
 
         if eval_streams is None:
             eval_streams = [experiences_list]
@@ -202,9 +202,9 @@ def eval(
         self.is_training = False
         self.model.eval()
 
-        experiences_list: Iterable[TExperienceType] = (
-            _experiences_parameter_as_iterable(experiences)
-        )
+        experiences_list: Iterable[
+            TExperienceType
+        ] = _experiences_parameter_as_iterable(experiences)
         self.current_eval_stream = experiences_list
 
         self._before_eval(**kwargs)