diff --git a/CHANGELOG.asciidoc b/CHANGELOG.asciidoc
index cb5d4ceffaab..dc73dc05a950 100644
--- a/CHANGELOG.asciidoc
+++ b/CHANGELOG.asciidoc
@@ -29,6 +29,8 @@ https://github.com/elastic/beats/compare/v6.3.2...6.3[Check the HEAD diff]
 
 *Affecting all Beats*
 
+- Fix a race condition with the `add_host_metadata` and the event serialization. {pull}8223[8223]
+
 *Auditbeat*
 
 *Filebeat*
diff --git a/libbeat/processors/add_host_metadata/add_host_metadata.go b/libbeat/processors/add_host_metadata/add_host_metadata.go
index 65d8dbb65446..44018f9e448e 100644
--- a/libbeat/processors/add_host_metadata/add_host_metadata.go
+++ b/libbeat/processors/add_host_metadata/add_host_metadata.go
@@ -38,7 +38,7 @@ func newHostMetadataProcessor(_ *common.Config) (processors.Processor, error) {
 // Run enriches the given event with the host meta data
 func (p *addHostMetadata) Run(event *beat.Event) (*beat.Event, error) {
 	p.loadData()
-	event.Fields.DeepUpdate(p.data)
+	event.Fields.DeepUpdate(p.data.Clone())
 	return event, nil
 }