diff --git a/src/abstractions/api.service.ts b/src/abstractions/api.service.ts
index db6f351637..eba6d8582d 100644
--- a/src/abstractions/api.service.ts
+++ b/src/abstractions/api.service.ts
@@ -20,7 +20,6 @@ export abstract class ApiService {
     baseUrl: string;
     identityBaseUrl: string;
     deviceType: string;
-    logoutCallback: Function;
 
     setUrls: (urls: EnvironmentUrls) => void;
     postIdentityToken: (request: TokenRequest) => Promise<IdentityTokenResponse | IdentityTwoFactorResponse>;
diff --git a/src/services/api.service.ts b/src/services/api.service.ts
index cda9888685..97eed0326f 100644
--- a/src/services/api.service.ts
+++ b/src/services/api.service.ts
@@ -27,11 +27,9 @@ export class ApiService implements ApiServiceAbstraction {
     baseUrl: string;
     identityBaseUrl: string;
     deviceType: string;
-    logoutCallback: Function;
 
     constructor(private tokenService: TokenService, private platformUtilsService: PlatformUtilsService,
-        logoutCallback: Function) {
-        this.logoutCallback = logoutCallback;
+        private logoutCallback: (expired: boolean) => Promise<void>) {
         this.deviceType = platformUtilsService.getDevice().toString();
     }
 
@@ -425,7 +423,7 @@ export class ApiService implements ApiServiceAbstraction {
 
     private async handleError(response: Response, tokenError: boolean): Promise<ErrorResponse> {
         if ((tokenError && response.status === 400) || response.status === 401 || response.status === 403) {
-            this.logoutCallback(true);
+            await this.logoutCallback(true);
             return null;
         }
 
diff --git a/src/services/nodeApi.service.ts b/src/services/nodeApi.service.ts
index 7803eafdc8..e5900f2409 100644
--- a/src/services/nodeApi.service.ts
+++ b/src/services/nodeApi.service.ts
@@ -12,7 +12,7 @@ import { TokenService } from '../abstractions/token.service';
 
 export class NodeApiService extends ApiService {
     constructor(tokenService: TokenService, platformUtilsService: PlatformUtilsService,
-        logoutCallback: Function) {
+        logoutCallback: (expired: boolean) => Promise<void>) {
         super(tokenService, platformUtilsService, logoutCallback);
     }
 }
diff --git a/src/services/sync.service.ts b/src/services/sync.service.ts
index 2a001e01a8..c053a34f63 100644
--- a/src/services/sync.service.ts
+++ b/src/services/sync.service.ts
@@ -30,7 +30,7 @@ export class SyncService implements SyncServiceAbstraction {
         private settingsService: SettingsService, private folderService: FolderService,
         private cipherService: CipherService, private cryptoService: CryptoService,
         private collectionService: CollectionService, private storageService: StorageService,
-        private messagingService: MessagingService, private logoutCallback: Function) {
+        private messagingService: MessagingService, private logoutCallback: (expired: boolean) => Promise<void>) {
     }
 
     async getLastSync(): Promise<Date> {
@@ -134,7 +134,7 @@ export class SyncService implements SyncServiceAbstraction {
         const stamp = await this.userService.getSecurityStamp();
         if (stamp != null && stamp !== response.securityStamp) {
             if (this.logoutCallback != null) {
-                this.logoutCallback(true);
+                await this.logoutCallback(true);
             }
 
             throw new Error('Stamp has changed');