diff --git a/cdp/smart_contract.py b/cdp/smart_contract.py
index b2eaf3e..f1fa4fa 100644
--- a/cdp/smart_contract.py
+++ b/cdp/smart_contract.py
@@ -157,7 +157,7 @@ def deployer_address(self) -> str:
         return self._model.deployer_address
 
     @property
-    def is_external(self) -> str:
+    def is_external(self) -> bool:
         """Get the contract address of the smart contract.
 
         Returns: