diff --git a/x-pack/legacy/plugins/alerting/server/routes/create.test.ts b/x-pack/legacy/plugins/alerting/server/routes/create.test.ts
index 6c18deeee7580..51b9668b6131a 100644
--- a/x-pack/legacy/plugins/alerting/server/routes/create.test.ts
+++ b/x-pack/legacy/plugins/alerting/server/routes/create.test.ts
@@ -41,7 +41,7 @@ test('creates an alert with proper parameters', async () => {
   };
 
   const createdAt = new Date();
-  const updatedAt = null;
+  const updatedAt = new Date();
   alertsClient.create.mockResolvedValueOnce({
     ...mockedAlert,
     createdAt,
diff --git a/x-pack/legacy/plugins/alerting/server/routes/get.test.ts b/x-pack/legacy/plugins/alerting/server/routes/get.test.ts
index 7af3a11ee6d77..2ac7d257139f3 100644
--- a/x-pack/legacy/plugins/alerting/server/routes/get.test.ts
+++ b/x-pack/legacy/plugins/alerting/server/routes/get.test.ts
@@ -18,7 +18,7 @@ const mockedAlert = {
     bar: true,
   },
   createdAt: new Date(),
-  updatedAt: null,
+  updatedAt: new Date(),
   actions: [
     {
       group: 'default',