diff --git a/synapse/config/metrics.py b/synapse/config/metrics.py

index dfd27e1523..2b289f4208 100644
--- a/synapse/config/metrics.py
+++ b/synapse/config/metrics.py
@@ -56,7 +56,9 @@ class MetricsConfig(Config):
             try:
                 check_requirements("sentry")
             except DependencyException as e:
-                raise ConfigError(e.message)
+                raise ConfigError(
+                    e.message  # noqa: B306, DependencyException.message is a property
+                )
 
             self.sentry_dsn = config["sentry"].get("dsn")
             if not self.sentry_dsn: