diff --git a/cmd/common-main.go b/cmd/common-main.go
index e9d00dce2..66cb10efc 100644
--- a/cmd/common-main.go
+++ b/cmd/common-main.go
@@ -105,6 +105,7 @@ func init() {
 	gob.Register(StorageErr(""))
 	gob.Register(madmin.TimeInfo{})
 	gob.Register(madmin.XFSErrorConfigs{})
+	gob.Register(map[string]string{})
 	gob.Register(map[string]interface{}{})
 
 	// All minio-go and madmin-go API operations shall be performed only once,