diff --git a/x-pack/test/api_integration/apis/security_solution/timeline_details.ts b/x-pack/test/api_integration/apis/security_solution/timeline_details.ts
index 22dc776f9f9c6..4c605b8de103f 100644
--- a/x-pack/test/api_integration/apis/security_solution/timeline_details.ts
+++ b/x-pack/test/api_integration/apis/security_solution/timeline_details.ts
@@ -544,7 +544,7 @@ const EXPECTED_DATA = [
     values: ['filebeat-7.0.0-iot-2019.06'],
     originalValue: ['filebeat-7.0.0-iot-2019.06'],
   },
-  { category: '_type', field: '_type', values: ['_doc'], originalValue: '_doc' },
+  { category: '_type', field: '_type', values: ['_doc'], originalValue: ['_doc'] },
   {
     category: '_id',
     field: '_id',