diff --git a/lisainstrument/instrument.py b/lisainstrument/instrument.py
index 6fc400cd95ecc3067834112c21f1b9f2acf6d475..bc54e0ba444cbf0b6bf91b8b5a95ff0cf3cc0269 100644
--- a/lisainstrument/instrument.py
+++ b/lisainstrument/instrument.py
@@ -1074,7 +1074,7 @@ class Instrument:
         # Laser noise are only generated for lasers locked on cavities,
         # in `simulate_locking.lock_on_cavity()`
 
-        self.laser_noises = ForEachMOSA(None)
+        self.laser_noises = ForEachMOSA(0)
 
         ## Clock noise