diff --git a/src/plugins/profiling/server/routes/search_flamechart.ts b/src/plugins/profiling/server/routes/search_flamechart.ts
index 0115ba3144794..5c5cc76ec1471 100644
--- a/src/plugins/profiling/server/routes/search_flamechart.ts
+++ b/src/plugins/profiling/server/routes/search_flamechart.ts
@@ -66,6 +66,7 @@ export function registerFlameChartSearchRoute(router: IRouter<DataRequestHandler
           projectID: schema.maybe(schema.string()),
           timeFrom: schema.maybe(schema.string()),
           timeTo: schema.maybe(schema.string()),
+          n: schema.maybe(schema.number()),
         }),
       },
     },