diff --git a/src/charm.py b/src/charm.py
index e9b21ed..6f01414 100755
--- a/src/charm.py
+++ b/src/charm.py
@@ -71,7 +71,7 @@ def _on_config_changed(self, event: ops.ConfigChangedEvent) -> None:
             event: event triggering the handler.
         """
         # Fetch the new config value
-        log_level = self.model.config["log-level"].lower()
+        log_level = str(self.model.config["log-level"]).lower()
 
         # Do some validation of the configuration option
         if log_level in VALID_LOG_LEVELS: