diff --git a/modules/sheets/pokemonCharacterSheet.js b/modules/sheets/pokemonCharacterSheet.js
index 947708d..7672a88 100644
--- a/modules/sheets/pokemonCharacterSheet.js
+++ b/modules/sheets/pokemonCharacterSheet.js
@@ -419,10 +419,10 @@ export default class pokemonCharacterSheet extends api.HandlebarsApplicationMixi
     calcEffectiveness(context, type) {
         var effectiveness = 1
 
-        effectiveness *= effectivenessChart[type][context.system.type1]
+        effectiveness *= this.effectivenessChart[type][context.system.type1]
 
         if (context.system.type2 != "") {
-            effectiveness *= effectivenessChart[type][context.system.type2]
+            effectiveness *= this.effectivenessChart[type][context.system.type2]
         }
 
         return effectiveness
diff --git a/system.json b/system.json
index 9dfbf6a..563a8cf 100644
--- a/system.json
+++ b/system.json
@@ -1,5 +1,5 @@
 {
-    "version": "0.1.12",
+    "version": "0.1.13",
     "id": "pokemon",
     "title": "Pokémon TTRPG",
     "description": "A Pokémon TTRPG",
diff --git a/system.zip b/system.zip
index 5ccdc00..29b12cb 100644
Binary files a/system.zip and b/system.zip differ