diff --git a/backend/api/posts/serializers.py b/backend/api/posts/serializers.py
index df62ca9..c26be2b 100644
--- a/backend/api/posts/serializers.py
+++ b/backend/api/posts/serializers.py
@@ -1,6 +1,7 @@
 from typing import Dict, List, Optional
 from rest_framework import serializers
 
+from django.urls import reverse
 from django.utils.timezone import localtime
 
 from apps.archive.models import PostModel
@@ -45,7 +46,11 @@ class PostPreviewSerializer(serializers.ModelSerializer):
         return [{"slug": i.slug, "name": i.name} for i in obj.category.all()]
 
     def get_creator(self, obj: PostModel) -> Dict[str, Optional[str]]:
-        avatar_url = obj.creator.avatar.file.url if obj.creator.avatar else None
+        avatar_url = (
+            reverse("serve_file", args=[obj.creator.avatar.hash_blake3])
+            if obj.creator.avatar
+            else None
+        )
         return {
             "slug": obj.creator.slug,
             "name": obj.creator.name,
@@ -63,7 +68,10 @@ class PostPreviewSerializer(serializers.ModelSerializer):
         data = []
         for i in obj.files.all():
             data.append(
-                {"type": i.file_type, "mimetype": i.mimetype, "src": i.file.url}
+                {
+                    "type": i.file_type,
+                    "src": reverse("serve_file", args=[i.hash_blake3]),
+                }
             )
         return data