diff --git a/x-pack/plugins/endpoint/server/routes/resolver/utils/normalize.ts b/x-pack/plugins/endpoint/server/routes/resolver/utils/normalize.ts
index 67a532d949e81..6d5ac8efdc1da 100644
--- a/x-pack/plugins/endpoint/server/routes/resolver/utils/normalize.ts
+++ b/x-pack/plugins/endpoint/server/routes/resolver/utils/normalize.ts
@@ -4,28 +4,25 @@
  * you may not use this file except in compliance with the Elastic License.
  */
 
-import { ResolverEvent, LegacyEndpointEvent } from '../../../../common/types';
-
-function isLegacyData(data: ResolverEvent): data is LegacyEndpointEvent {
-  return data.agent?.type === 'endgame';
-}
+import { ResolverEvent } from '../../../../common/types';
+import { isLegacyEvent } from '../../../../common/models/event';
 
 export function extractEventID(event: ResolverEvent) {
-  if (isLegacyData(event)) {
+  if (isLegacyEvent(event)) {
     return String(event.endgame.serial_event_id);
   }
   return event.event.id;
 }
 
 export function extractEntityID(event: ResolverEvent) {
-  if (isLegacyData(event)) {
+  if (isLegacyEvent(event)) {
     return String(event.endgame.unique_pid);
   }
   return event.process.entity_id;
 }
 
 export function extractParentEntityID(event: ResolverEvent) {
-  if (isLegacyData(event)) {
+  if (isLegacyEvent(event)) {
     const ppid = event.endgame.unique_ppid;
     return ppid && String(ppid); // if unique_ppid is undefined return undefined
   }