diff --git a/synapse/util/metrics.py b/synapse/util/metrics.py
index faf3793346..6a389f7a7e 100644
--- a/synapse/util/metrics.py
+++ b/synapse/util/metrics.py
@@ -46,7 +46,6 @@ from synapse.util import Clock
 
 logger = logging.getLogger(__name__)
 
-
 block_counter = Counter("synapse_util_metrics_block_count", "", ["block_name"])
 
 block_timer = Counter("synapse_util_metrics_block_time_seconds", "", ["block_name"])