diff --git a/lisainstrument/instrument.py b/lisainstrument/instrument.py
index 1da42073569a86946a8c5a99059bf09b88b7709c..144789e57714505ec9d2b61892ed47547c02ed44 100755
--- a/lisainstrument/instrument.py
+++ b/lisainstrument/instrument.py
@@ -799,6 +799,7 @@ class Instrument:
         self.sc_jitter_eta_asds = ForEachSC(0)
         self.sc_jitter_theta_asds = ForEachSC(0)
         self.mosa_jitter_phi_asds = ForEachMOSA(0)
+        self.mosa_jitter_eta_asds = ForEachMOSA(0)
 
     def disable_dopplers(self):
         """Set proper pseudo-range derivatives to zero to turn off Doppler effects."""