diff --git a/apps/api/src/app/auth/google.strategy.ts b/apps/api/src/app/auth/google.strategy.ts
index 02f82a7a8..3e4b4ca0d 100644
--- a/apps/api/src/app/auth/google.strategy.ts
+++ b/apps/api/src/app/auth/google.strategy.ts
@@ -3,6 +3,7 @@ import { ConfigurationService } from '@ghostfolio/api/services/configuration/con
 import { Injectable, Logger } from '@nestjs/common';
 import { PassportStrategy } from '@nestjs/passport';
 import { Provider } from '@prisma/client';
+import { DoneCallback } from 'passport';
 import { Profile, Strategy } from 'passport-google-oauth20';
 
 import { AuthService } from './auth.service';
@@ -29,7 +30,7 @@ export class GoogleStrategy extends PassportStrategy(Strategy, 'google') {
     _token: string,
     _refreshToken: string,
     profile: Profile,
-    done: Function
+    done: DoneCallback
   ) {
     try {
       const jwt = await this.authService.validateOAuthLogin({
diff --git a/apps/client/src/app/core/module-preload.service.ts b/apps/client/src/app/core/module-preload.service.ts
index fcba48c52..85d9c5e33 100644
--- a/apps/client/src/app/core/module-preload.service.ts
+++ b/apps/client/src/app/core/module-preload.service.ts
@@ -7,7 +7,7 @@ export class ModulePreloadService implements PreloadingStrategy {
   /**
    * Preloads all lazy loading modules with the attribute 'preload' set to true
    */
-  preload(route: Route, load: Function): Observable<any> {
+  preload<T>(route: Route, load: () => Observable<T>): Observable<T | null> {
     return route.data?.preload ? load() : of(null);
   }
 }