diff --git a/metagpt/roles/role.py b/metagpt/roles/role.py
index 71f6ec8f5..b234a846f 100644
--- a/metagpt/roles/role.py
+++ b/metagpt/roles/role.py
@@ -166,7 +166,7 @@ class Role(SerializationMixin, is_polymorphic_base=True):
         Role.model_rebuild()
         super().__init__(**data)
 
-        if data.get("is_human"):
+        if self.is_human:
             self.llm = HumanProvider()
 
         self.llm.system_prompt = self._get_prefix()