diff --git a/src/qibocal/protocols/rabi/length_frequency.py b/src/qibocal/protocols/rabi/length_frequency.py
index 9dfa2ec3d..be9b13a13 100644
--- a/src/qibocal/protocols/rabi/length_frequency.py
+++ b/src/qibocal/protocols/rabi/length_frequency.py
@@ -53,9 +53,6 @@ class RabiLengthFrequencyResults(RabiLengthFrequencySignalResults):
 class RabiLengthFreqData(RabiLengthFreqSignalData):
     """RabiLengthFreq data acquisition."""
 
-    rx90: bool
-    """Pi or Pi_half calibration"""
-
     data: dict[QubitId, npt.NDArray[RabiLenFreqType]] = field(default_factory=dict)
     """Raw data acquired."""