diff --git a/src/gateway/protocol/cron-validators.test.ts b/src/gateway/protocol/cron-validators.test.ts
index 1de9db206b9..3d869131580 100644
--- a/src/gateway/protocol/cron-validators.test.ts
+++ b/src/gateway/protocol/cron-validators.test.ts
@@ -54,6 +54,43 @@ describe("cron protocol validators", () => {
     expect(validateCronUpdateParams({ jobId: "job-2", patch: { enabled: true } })).toBe(true);
   });
 
+  it("accepts delivery threadId on add and update params", () => {
+    expect(
+      validateCronAddParams({
+        ...minimalAddParams,
+        delivery: {
+          mode: "announce",
+          channel: "telegram",
+          to: "-100123",
+          threadId: 42,
+        },
+      }),
+    ).toBe(true);
+    expect(
+      validateCronUpdateParams({
+        id: "job-1",
+        patch: {
+          delivery: {
+            mode: "announce",
+            channel: "telegram",
+            to: "-100123",
+            threadId: "topic-42",
+          },
+        },
+      }),
+    ).toBe(true);
+    expect(
+      validateCronUpdateParams({
+        id: "job-1",
+        patch: {
+          delivery: {
+            threadId: 42,
+          },
+        },
+      }),
+    ).toBe(true);
+  });
+
   it("accepts remove params for id and jobId selectors", () => {
     expect(validateCronRemoveParams({ id: "job-1" })).toBe(true);
     expect(validateCronRemoveParams({ jobId: "job-2" })).toBe(true);