diff --git a/haproxy-operator/lib/charms/haproxy/v1/haproxy_route_tcp.py b/haproxy-operator/lib/charms/haproxy/v1/haproxy_route_tcp.py
index 0fe2b3757..80b382ae1 100644
--- a/haproxy-operator/lib/charms/haproxy/v1/haproxy_route_tcp.py
+++ b/haproxy-operator/lib/charms/haproxy/v1/haproxy_route_tcp.py
@@ -1559,7 +1559,7 @@ def configure_backend_port(self, backend_port: int) -> "Self":
         self._application_data["backend_port"] = backend_port
         return self
 
-    def configure_hosts(self, hosts: Optional[list[int]] = None) -> "Self":
+    def configure_hosts(self, hosts: Optional[list[str]] = None) -> "Self":
         """Set backend hosts.
 
         Args: