diff --git a/eos/effects/modulebonussiegemodule.py b/eos/effects/modulebonussiegemodule.py
index 93890033e..bb5258be6 100644
--- a/eos/effects/modulebonussiegemodule.py
+++ b/eos/effects/modulebonussiegemodule.py
@@ -46,7 +46,7 @@ def handler(fit, src, context):
     # new in April 2016 release
     # missile ROF bonus
     for group in ("Missile Launcher XL Torpedo", "Missile Launcher Rapid Torpedo", "Missile Launcher XL Cruise"):
-        fit.modules.filteredItemBoost(lambda mod: mod.item.group.name == group, "speed", src.getModifiedItemAttr("siegeLauncherROFBonus"), stackingPenalties=True)
+        fit.modules.filteredItemBoost(lambda mod: mod.item.group.name == group, "speed", src.getModifiedItemAttr("siegeLauncherROFBonus"))
 
     fit.modules.filteredChargeBoost(lambda mod: mod.charge.requiresSkill("Torpedoes"), "maxVelocity", src.getModifiedItemAttr("siegeTorpedoVelocityBonus"), stackingPenalties=True)