diff --git a/octopoes/octopoes/models/__init__.py b/octopoes/octopoes/models/__init__.py
index 6f84d589320..362b4c0d254 100644
--- a/octopoes/octopoes/models/__init__.py
+++ b/octopoes/octopoes/models/__init__.py
@@ -240,7 +240,7 @@ def _serialize_value(self, value: Any, required: bool) -> SerializedOOIValue:
             return str(value)
 
     def __hash__(self):
-        return hash(self.model_dump_json())
+        return hash(self.primary_key)
 
 
 OOIClassType = TypeVar("OOIClassType")