diff --git a/spec/unit/queueToDevice.spec.ts b/spec/unit/queueToDevice.spec.ts
index 02c39bb1c..a1ae2bcfe 100644
--- a/spec/unit/queueToDevice.spec.ts
+++ b/spec/unit/queueToDevice.spec.ts
@@ -244,7 +244,8 @@ describe.each([
 
         client.retryImmediately();
 
-        expect(await httpBackend.flush(null, 1, 20)).toEqual(1);
+        // longer timeout here to try & avoid flakiness
+        expect(await httpBackend.flush(null, 1, 3000)).toEqual(1);
     });
 
     it("retries on when client is started", async function() {