diff --git a/src/charm.py b/src/charm.py
index 7c8332c0..d86e964d 100755
--- a/src/charm.py
+++ b/src/charm.py
@@ -283,7 +283,7 @@ def _on_check_config(self, event: ActionEvent) -> None:
     def _on_show_config_action(self, event: ActionEvent):
         """Hook for the show-config action."""
         event.log(f"Fetching {self._config_path}")
-        if not self.alertmanager_workload.is_ready():
+        if not self.alertmanager_workload.is_ready:
             event.fail("Container not ready")
 
         filepaths = self._render_manifest().manifest.keys()