diff --git a/check/health_check.go b/check/health_check.go
index 04e023f..bb8e39f 100644
--- a/check/health_check.go
+++ b/check/health_check.go
@@ -112,7 +112,7 @@ func (check *HealthCheck) CheckHealth(brokerUpdates chan<- Update, clusterUpdate
 func newUpdate(report StatusReport, name string) Update {
 	data, err := report.Json()
 	if err != nil {
-		log.Warn("Error while marshaling %s status: %s", name, err.Error())
+		log.Warnf("Error while marshaling %s status: %s", name, err.Error())
 		data = simpleStatus(report.Summary())
 	}
 	return Update{report.Summary(), data}