diff --git a/src/backend/index.ts b/src/backend/index.ts
index b8b48fa6..37a4dae7 100644
--- a/src/backend/index.ts
+++ b/src/backend/index.ts
@@ -18,7 +18,7 @@ import { parseVersion } from "./version.js";
 import { initServer } from "./server/index.js";
 import { createHeartbeatClientsTask } from "./tasks/heartbeatClients.js";
 import { createHeartbeatSourcesTask } from "./tasks/heartbeatSources.js";
-import { isDebugMode, parseBool, retry, sleep } from "./utils.js";
+import { isDebugMode, parseBool, retry } from "./utils.js";
 import { readJson } from './utils/DataUtils.js';
 //import { createVegaGenerator } from './utils/SchemaUtils.js';
 import ScrobbleClients from './scrobblers/ScrobbleClients.js';
diff --git a/src/backend/utils/AsyncUtils.ts b/src/backend/utils/AsyncUtils.ts
index 949ad901..02bc77ad 100644
--- a/src/backend/utils/AsyncUtils.ts
+++ b/src/backend/utils/AsyncUtils.ts
@@ -62,7 +62,7 @@ export function staggerMapper<Element, NewElement>(options: StaggerOptions) {
 
   return (mapper: Mapper<Element, NewElement>) => async (x: Element, index: number) => {
     if (index < concurrency) {
-      sleep(initialStagger);
+      await sleep(initialStagger);
       initialStagger += initialInterval;
     } else {
       const s = Math.min((Math.random() * 1000), maxRandomStagger)