diff --git a/src/aequitas/flow/methods/preprocessing/label_flipping.py b/src/aequitas/flow/methods/preprocessing/label_flipping.py
index e52120d7..d1427115 100644
--- a/src/aequitas/flow/methods/preprocessing/label_flipping.py
+++ b/src/aequitas/flow/methods/preprocessing/label_flipping.py
@@ -273,7 +273,7 @@ def _label_flipping(self, y: pd.Series, s: Optional[pd.Series], scores: pd.Serie
                 if self.ordering_method == "residuals"
                 else y_flipped.loc[scores <= 0].index
             )
-            to_flip = pd.Series(index=flip_index).fillna(False).loc[y_flipped.index]
+            to_flip = pd.Series(index=flip_index).fillna(False)
             for group, flips in group_flips.items():
                 if flips > 0:
                     labels = y == 0