diff --git a/weed/command/master.go b/weed/command/master.go
index 178827550..3ed2b5a8b 100644
--- a/weed/command/master.go
+++ b/weed/command/master.go
@@ -465,6 +465,12 @@ func peerIndex(self pb.ServerAddress, peers []pb.ServerAddress) int {
 }
 
 func (m *MasterOptions) toMasterOption(whiteList []string) *weed_server.MasterOption {
+	// Not every caller wires up every flag, so treat an unset metrics port as
+	// disabled rather than dereferencing nil.
+	metricsPort := 0
+	if m.metricsHttpPort != nil {
+		metricsPort = *m.metricsHttpPort
+	}
 	masterAddress := pb.NewServerAddress(*m.ip, *m.port, *m.portGrpc)
 	return &weed_server.MasterOption{
 		Master:                     masterAddress,
@@ -479,7 +485,7 @@ func (m *MasterOptions) toMasterOption(whiteList []string) *weed_server.MasterOp
 		WhiteList:               whiteList,
 		DisableHttp:             *m.disableHttp,
 		MetricsAddress:          *m.metricsAddress,
-		MetricsPort:             *m.metricsHttpPort,
+		MetricsPort:             metricsPort,
 		MetricsIntervalSec:      *m.metricsIntervalSec,
 		TelemetryUrl:            *m.telemetryUrl,
 		TelemetryEnabled:        *m.telemetryEnabled,
diff --git a/weed/command/mini.go b/weed/command/mini.go
index 8ce45436a..500cee52d 100644
--- a/weed/command/mini.go
+++ b/weed/command/mini.go
@@ -1308,6 +1308,13 @@ func runMini(cmd *Command, args []string) bool {
 	}
 	pb.RegisterLocalGrpcSocket(*miniIp, *miniAdminOptions.grpcPort, fmt.Sprintf("/tmp/seaweedfs-admin-grpc-%d.sock", *miniAdminOptions.grpcPort))
 
+	// One process, one shared Prometheus registry, so this single listener
+	// serves every component's series. Point each component at it so they all
+	// advertise the same port to the master.
+	miniMasterOptions.metricsHttpPort = miniMetricsHttpPort
+	miniOptions.v.metricsHttpPort = miniMetricsHttpPort
+	miniFilerOptions.metricsHttpPort = miniMetricsHttpPort
+
 	go stats_collect.StartMetricsServer(*miniMetricsHttpIp, *miniMetricsHttpPort)
 
 	if *miniMasterOptions.volumeSizeLimitMB > util.MaxVolumeSizeLimitMB {