diff --git a/src/chat/chat.service.ts b/src/chat/chat.service.ts
index 583dc5d..ae8501d 100644
--- a/src/chat/chat.service.ts
+++ b/src/chat/chat.service.ts
@@ -61,6 +61,7 @@ const AI_CHAT_CONTEXT_MESSAGE_LIMIT = 6;
 @Injectable()
 export class ChatService {
   private readonly authServerUrl: string;
+  private readonly authPublicUrl: string;
 
   constructor(
     private readonly authService: AuthService,
@@ -71,6 +72,9 @@ export class ChatService {
     this.authServerUrl = this.configService
       .get<string>('AUTH_SERVER_URL', 'http://localhost:4100')
       .replace(/\/$/, '');
+    this.authPublicUrl = this.configService
+      .get<string>('AUTH_PUBLIC_URL', this.authServerUrl)
+      .replace(/\/$/, '');
   }
 
   async listThreads(accessToken: string | undefined, query: ListChatThreadsDto) {
@@ -977,11 +981,11 @@ export class ChatService {
     if (!user) return null;
 
     if (user.authUserId) {
-      return `${this.authServerUrl}/auth/users/${user.authUserId}/avatar`;
+      return `${this.authPublicUrl}/auth/users/${user.authUserId}/avatar`;
     }
 
     if (user.email) {
-      return `${this.authServerUrl}/auth/users/avatar?email=${encodeURIComponent(user.email)}`;
+      return `${this.authPublicUrl}/auth/users/avatar?email=${encodeURIComponent(user.email)}`;
     }
 
     return null;