diff --git a/src/charm.py b/src/charm.py
index c00ca91..4b2c580 100755
--- a/src/charm.py
+++ b/src/charm.py
@@ -129,7 +129,7 @@ def api_port(self) -> str:
         if not isinstance(api_addresses, List):
             raise AgentConfException("agent.conf key 'apiaddresses' is not a list")
 
-        return api_addresses[0].split(':')[1]
+        return api_addresses[0].split(':')[-1]
 
     def ca_cert(self) -> str:
         """Return the controller's CA certificate."""