diff --git a/eos/effects/modulebonusdronedamageamplifier.py b/eos/effects/modulebonusdronedamageamplifier.py
index 8d5f03de1..09bb40dec 100644
--- a/eos/effects/modulebonusdronedamageamplifier.py
+++ b/eos/effects/modulebonusdronedamageamplifier.py
@@ -4,7 +4,7 @@
 # Modules from group: Drone Damage Modules (11 of 11)
 type = "passive"
 def handler(fit, src, context):
-    fit.fighters.filteredItemBoost(lambda mod: mod.item.requiresSkill("Fighters"), "fighterAbilityMissilesDamageMultiplier", src.getModifiedItemAttr("droneDamageBonus"))
-    fit.fighters.filteredItemBoost(lambda mod: mod.item.requiresSkill("Fighters"), "fighterAbilityAttackTurretDamageMultiplier", src.getModifiedItemAttr("droneDamageBonus"))
-    fit.fighters.filteredItemBoost(lambda mod: mod.item.requiresSkill("Fighters"), "fighterAbilityAttackMissileDamageMultiplier", src.getModifiedItemAttr("droneDamageBonus"))
+    fit.fighters.filteredItemBoost(lambda mod: mod.item.requiresSkill("Fighters"), "fighterAbilityMissilesDamageMultiplier", src.getModifiedItemAttr("droneDamageBonus"), stackingPenalties=True)
+    fit.fighters.filteredItemBoost(lambda mod: mod.item.requiresSkill("Fighters"), "fighterAbilityAttackTurretDamageMultiplier", src.getModifiedItemAttr("droneDamageBonus"), stackingPenalties=True)
+    fit.fighters.filteredItemBoost(lambda mod: mod.item.requiresSkill("Fighters"), "fighterAbilityAttackMissileDamageMultiplier", src.getModifiedItemAttr("droneDamageBonus"), stackingPenalties=True)
     fit.drones.filteredItemBoost(lambda mod: mod.item.requiresSkill("Drones"), "damageMultiplier", src.getModifiedItemAttr("droneDamageBonus"), stackingPenalties=True)