diff --git a/CHANGELOG.asciidoc b/CHANGELOG.asciidoc
index e0a3632cf48..97b6b684109 100644
--- a/CHANGELOG.asciidoc
+++ b/CHANGELOG.asciidoc
@@ -42,6 +42,7 @@ https://github.com/elastic/beats/compare/v6.4.0...6.4[Check the HEAD diff]
 - Replace index patterns in TSVB visualizations. {pull}7929[7929]
 - Add backoff support to x-pack monitoring outputs. {issue}7966[7966]
 - Removed execute permissions systemd unit file. {pull}7873[7873]
+- Fix a race condition with the `add_host_metadata` and the event serialization. {pull}8223[8223]
 
 *Auditbeat*
 
diff --git a/libbeat/processors/add_host_metadata/add_host_metadata.go b/libbeat/processors/add_host_metadata/add_host_metadata.go
index c4742af81b8..f9597cb79f2 100644
--- a/libbeat/processors/add_host_metadata/add_host_metadata.go
+++ b/libbeat/processors/add_host_metadata/add_host_metadata.go
@@ -70,7 +70,7 @@ func newHostMetadataProcessor(cfg *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
 }