diff --git a/src/shrpx_health_monitor_downstream_connection.cc b/src/shrpx_health_monitor_downstream_connection.cc
index 6e33bc15..89e53963 100644
--- a/src/shrpx_health_monitor_downstream_connection.cc
+++ b/src/shrpx_health_monitor_downstream_connection.cc
@@ -98,7 +98,8 @@ int HealthMonitorDownstreamConnection::on_read() { return 0; }
 
 int HealthMonitorDownstreamConnection::on_write() { return 0; }
 
-void HealthMonitorDownstreamConnection::on_upstream_change(Upstream *upstream) {}
+void HealthMonitorDownstreamConnection::on_upstream_change(Upstream *upstream) {
+}
 
 bool HealthMonitorDownstreamConnection::poolable() const { return false; }