diff --git a/eos/modifiedAttributeDict.py b/eos/modifiedAttributeDict.py
index 199cb4308..a9a0e9fe5 100644
--- a/eos/modifiedAttributeDict.py
+++ b/eos/modifiedAttributeDict.py
@@ -300,7 +300,7 @@ class ModifiedAttributeDict(collections.MutableMapping):
         else:
             if not attributeName in self.__multipliers:
                 self.__multipliers[attributeName] = 1
-            self.__multipliers[attributeName] *= multiplier or 1
+            self.__multipliers[attributeName] *= multiplier if multiplier is not None else 1
         self.__placehold(attributeName)
         self.__afflict(attributeName, "%s*" % ("s" if stackingPenalties else ""), multiplier, multiplier != 1)