diff --git a/x-pack/plugins/observability_solution/profiling/server/routes/topn.test.ts b/x-pack/plugins/observability_solution/profiling/server/routes/topn.test.ts
index 2985d8d9d78f70..b576c3b54d1445 100644
--- a/x-pack/plugins/observability_solution/profiling/server/routes/topn.test.ts
+++ b/x-pack/plugins/observability_solution/profiling/server/routes/topn.test.ts
@@ -69,6 +69,7 @@ describe('TopN data from Elasticsearch', () => {
           },
         }) as Promise<any>
     ),
+    topNFunctions: jest.fn(),
   };
   const logger = loggerMock.create();