diff --git a/src/qibocal/protocols/characterization/flipping.py b/src/qibocal/protocols/characterization/flipping.py
index 7444d6850..575690a08 100644
--- a/src/qibocal/protocols/characterization/flipping.py
+++ b/src/qibocal/protocols/characterization/flipping.py
@@ -172,8 +172,8 @@ def _fit(data: FlippingData) -> FlippingResults:
             popt = popt.tolist()
         except:
             log.warning("flipping_fit: the fitting was not succesful")
-            popt = [0] * 4
-            perr = [1] * 4
+            popt = [0] * 5
+            perr = [1] * 5
 
         if popt[3] > np.pi / 2 and popt[3] < 3 * np.pi / 2:
             signed_correction = -popt[2] / 2
diff --git a/src/qibocal/protocols/characterization/flipping_signal.py b/src/qibocal/protocols/characterization/flipping_signal.py
index fe6234ced..4d0fad5b7 100644
--- a/src/qibocal/protocols/characterization/flipping_signal.py
+++ b/src/qibocal/protocols/characterization/flipping_signal.py
@@ -167,7 +167,7 @@ def _fit(data: FlippingSignalData) -> FlippingSignalResults:
             )
         except:
             log.warning("flipping_fit: the fitting was not succesful")
-            popt = [0, 0, 0, 0]
+            popt = [0] * 5
 
         translated_popt = [
             y_min + (y_max - y_min) * popt[0],
@@ -178,10 +178,11 @@ def _fit(data: FlippingSignalData) -> FlippingSignalResults:
             popt[3] - x_min * 2 * np.pi * f / (x_max - x_min) * popt[2],
             popt[4] * 2 * np.pi * f / (x_max - x_min),
         ]
+        # TODO: this might be related to the resonator type
         if popt[3] > np.pi / 2 and popt[3] < 3 * np.pi / 2:
-            signed_correction = -translated_popt[2] / 2
-        else:
             signed_correction = translated_popt[2] / 2
+        else:
+            signed_correction = -translated_popt[2] / 2
         # The amplitude is directly proportional to the rotation angle
         corrected_amplitudes[qubit] = (pi_pulse_amplitude * np.pi) / (
             np.pi + signed_correction
@@ -190,7 +191,6 @@ def _fit(data: FlippingSignalData) -> FlippingSignalResults:
         amplitude_correction_factors[qubit] = (
             signed_correction / np.pi * pi_pulse_amplitude
         )
-
     return FlippingSignalResults(
         corrected_amplitudes, amplitude_correction_factors, fitted_parameters
     )