diff --git a/langchain/agents/agent.py b/langchain/agents/agent.py
index e7082f7b..c675b558 100644
--- a/langchain/agents/agent.py
+++ b/langchain/agents/agent.py
@@ -117,7 +117,7 @@ class BaseSingleActionAgent(BaseModel):
     def dict(self, **kwargs: Any) -> Dict:
         """Return dictionary representation of agent."""
         _dict = super().dict()
-        _dict["_type"] = self._agent_type
+        _dict["_type"] = str(self._agent_type)
         return _dict
 
     def save(self, file_path: Union[Path, str]) -> None:
@@ -229,7 +229,7 @@ class BaseMultiActionAgent(BaseModel):
     def dict(self, **kwargs: Any) -> Dict:
         """Return dictionary representation of agent."""
         _dict = super().dict()
-        _dict["_type"] = self._agent_type
+        _dict["_type"] = str(self._agent_type)
         return _dict
 
     def save(self, file_path: Union[Path, str]) -> None: