diff --git a/internal/browser/cors.go b/internal/browser/cors.go
index 7107ef28..b6bc631e 100644
--- a/internal/browser/cors.go
+++ b/internal/browser/cors.go
@@ -29,6 +29,7 @@ var DefaultAllowedHeaders = strings.Join([]string{ //nolint:gochecknoglobals
 	"X-LaunchDarkly-User-Agent",
 	"X-LaunchDarkly-Payload-ID",
 	"X-LaunchDarkly-Wrapper",
+	"X-LaunchDarkly-Instance-Id",
 	events.EventSchemaHeader,
 	events.TagsHeader,
 }, ",")