diff --git a/src/pymovements/dataset/dataset.py b/src/pymovements/dataset/dataset.py
index afb09c982..eeb56c83a 100644
--- a/src/pymovements/dataset/dataset.py
+++ b/src/pymovements/dataset/dataset.py
@@ -403,7 +403,7 @@ def detect(
             self,
             method: Callable[..., EventDataFrame] | str,
             *,
-            eye: str | None = 'auto',
+            eye: str = 'auto',
             clear: bool = False,
             verbose: bool = True,
             **kwargs: Any,