diff --git a/internal/subaccountsync/subaccount_sync_service.go b/internal/subaccountsync/subaccount_sync_service.go
index 99ebd86adc..a7609ede96 100644
--- a/internal/subaccountsync/subaccount_sync_service.go
+++ b/internal/subaccountsync/subaccount_sync_service.go
@@ -95,7 +95,7 @@ func (s *SyncService) Run() {
 	http.Handle("/metrics", promHandler)
 
 	go func() {
-		address := fmt.Sprintf(":%d", s.cfg.MetricsPort)
+		address := fmt.Sprintf(":%s", s.cfg.MetricsPort)
 		err := http.ListenAndServe(address, nil)
 		if err != nil {
 			logger.Error(fmt.Sprintf("while serving metrics: %s", err))