diff --git a/cas_wrapper.py b/cas_wrapper.py
index b4a154f..7bcd4f9 100644
--- a/cas_wrapper.py
+++ b/cas_wrapper.py
@@ -27,7 +27,7 @@ class CasWrapper:
                 SIGNER_ID=self._cas_signer_id
         ):
             self._cas = local['cas']
-            self._cas('login')
+            self._cas['login']()
 
     def notarize(self, local_git_repo_path: str) -> str:
         """