diff --git a/eos/effects.py b/eos/effects.py
index 19931d8ca..ec3997d6d 100644
--- a/eos/effects.py
+++ b/eos/effects.py
@@ -42448,7 +42448,8 @@ class Effect12761(BaseEffect):
             lambda mod: (mod.item.requiresSkill('Mining')
                          or mod.item.requiresSkill('Ice Harvesting')
                          or mod.item.requiresSkill('Gas Cloud Harvesting')),
-            'miningWasteProbability', src.getModifiedItemAttr('miningWasteProbabilityBonus'), **kwargs)
+            'miningWasteProbability', src.getModifiedItemAttr('miningWasteProbabilityBonus'),
+            stackingPenalties=True, **kwargs)
 
 
 class Effect12771(BaseEffect):
diff --git a/eos/saveddata/fit.py b/eos/saveddata/fit.py
index bf606e8cd..324fea120 100644
--- a/eos/saveddata/fit.py
+++ b/eos/saveddata/fit.py
@@ -951,7 +951,7 @@ class Fit:
                                 mod.item.requiresSkill("Mining")
                                 or mod.item.requiresSkill("Ice Harvesting")
                                 or mod.item.requiresSkill("Gas Cloud Harvesting")),
-                        "miningWasteProbability", value)
+                        "miningWasteProbability", value, stackingPenalties=True)
 
             del self.commandBonuses[warfareBuffID]