diff --git a/lisainstrument/instrument.py b/lisainstrument/instrument.py
index a7ab46f601e7a4f31178df912e93df19a2b8c459..e5665904970fe734a897ec13767ad90330d51718 100755
--- a/lisainstrument/instrument.py
+++ b/lisainstrument/instrument.py
@@ -808,12 +808,9 @@ class Instrument:
         ## Timer deviations from TCB
 
         self.tcb_timer_deviations = \
-            self.clock_offsets + \
-            self.clock_freqoffsets * self.telemetry_t + \
-            self.clock_freqlindrifts * self.telemetry_t**2 / 2 + \
-            self.clock_freqquaddrifts * self.telemetry_t**3 / 3 + \
-            self.tps_proper_time_deviations + \
-            self.tcb_sync_noises
+            self.local_timer_deviations \
+            + self.tps_proper_time_deviations \
+            + self.tcb_sync_noises
 
         ## TDIR tone