diff --git a/moabb/datasets/BEETL.py b/moabb/datasets/BEETL.py
index 021265b51..831470f28 100644
--- a/moabb/datasets/BEETL.py
+++ b/moabb/datasets/BEETL.py
@@ -235,7 +235,7 @@ def _get_single_subject_data(self, subject):
             )
         )
 
-        return {"0": {f"0{self.phase}_train": raw, f"1{self.phase}_test": test_raw}}
+        return {"0": {f"0{self.phase}train": raw, f"1{self.phase}test": test_raw}}
 
     def data_path(
         self, subject, path=None, force_update=False, update_path=None, verbose=None
@@ -463,7 +463,7 @@ def _get_single_subject_data(self, subject):
             )
         )
 
-        return {"0": {f"0{self.phase}_train": raw, f"1{self.phase}_test": test_raw}}
+        return {"0": {f"0{self.phase}train": raw, f"1{self.phase}test": test_raw}}
 
     def data_path(
         self, subject, path=None, force_update=False, update_path=None, verbose=None