diff --git a/devtools/src/app/app.config.ts b/devtools/src/app/app.config.ts
index 6cd4e2b864d5..fb79f441e301 100644
--- a/devtools/src/app/app.config.ts
+++ b/devtools/src/app/app.config.ts
@@ -41,7 +41,7 @@ export const appConfig: ApplicationConfig = {
       useClass: DemoApplicationEnvironment,
     },
     // We simulate a transfer state created by the server-side rendering.
-    provideAppInitializer(async () => serializeTransferState()),
+    provideAppInitializer(() => serializeTransferState()),
     provideSettings(),
   ],
 };
diff --git a/devtools/src/app/transfer-state.ts b/devtools/src/app/transfer-state.ts
index 957079df9e4f..667128bcb06b 100644
--- a/devtools/src/app/transfer-state.ts
+++ b/devtools/src/app/transfer-state.ts
@@ -12,7 +12,7 @@ import {APP_ID, DOCUMENT, inject, makeStateKey, TransferState} from '@angular/co
 /**
  * This function serializes the transfer state into the DOM.
  */
-export async function serializeTransferState(): Promise<void> {
+export function serializeTransferState(): void {
   const doc = inject(DOCUMENT);
   const appId = inject(APP_ID);
   const transferState = inject(TransferState);