diff --git a/pyhelios/simulation_builder.py b/pyhelios/simulation_builder.py
index 60568e1b4..e1558a89c 100644
--- a/pyhelios/simulation_builder.py
+++ b/pyhelios/simulation_builder.py
@@ -148,7 +148,8 @@ def build(self):
             self.writeWaveform,
             self.calcEchowidth,
             self.fullwaveNoise,
-            self.platformNoiseDisabled
+            self.platformNoiseDisabled,
+            False
         )
         if self.callback is not None:
             build.sim.setCallback(self.callback)