diff --git a/src/main/java/org/cyclops/cyclopscore/advancement/criterion/ModItemObtainedTrigger.java b/src/main/java/org/cyclops/cyclopscore/advancement/criterion/ModItemObtainedTrigger.java
index 8fe5992814..581731d0d6 100644
--- a/src/main/java/org/cyclops/cyclopscore/advancement/criterion/ModItemObtainedTrigger.java
+++ b/src/main/java/org/cyclops/cyclopscore/advancement/criterion/ModItemObtainedTrigger.java
@@ -25,7 +25,7 @@ public class ModItemObtainedTrigger extends SimpleCriterionTrigger<ModItemObtain
     public static final Codec<ModItemObtainedTrigger.Instance> CODEC = RecordCodecBuilder.create(
             p_311401_ -> p_311401_.group(
                             ExtraCodecs.strictOptionalField(EntityPredicate.ADVANCEMENT_CODEC, "player").forGetter(ModItemObtainedTrigger.Instance::player),
-                            Codec.STRING.fieldOf("modId").forGetter(ModItemObtainedTrigger.Instance::modId)
+                            Codec.STRING.fieldOf("mod_id").forGetter(ModItemObtainedTrigger.Instance::modId)
                     )
                     .apply(p_311401_, ModItemObtainedTrigger.Instance::new)
     );