diff --git a/ramp/core/core.py b/ramp/core/core.py
index 4177707..f617a2d 100644
--- a/ramp/core/core.py
+++ b/ramp/core/core.py
@@ -1824,7 +1824,7 @@ def calc_coincident_switch_on(self, inside_peak_window: bool = True):
                     1,
                     math.ceil(
                         random.gauss(
-                            mu=(self.number * mu_peak + 0.5),
+                            mu=(self.number * mu_peak),
                             sigma=(s_peak * self.number * mu_peak),
                         )
                     ),