diff --git a/app/routers/web.py b/app/routers/web.py
index 3b2de58..3faabf3 100644
--- a/app/routers/web.py
+++ b/app/routers/web.py
@@ -898,7 +898,7 @@ def postcard_delete(postcard_id: int, user: User = Depends(get_current_user_web)
 
 
 @router.post("/postcards/{postcard_id}/mark-delivered")
-def mark_delivered(
+async def mark_delivered(
     postcard_id: int,
     user: User = Depends(get_current_user_web),
     db: Session = Depends(get_db),
@@ -910,12 +910,12 @@ def mark_delivered(
         .first()
     )
     if not pc:
-        return _redirect("/profiles")
+        return JSONResponse({"ok": False}, status_code=404)
     pc.status = "delivered"
     if not pc.arrival_time:
         pc.arrival_time = datetime.now()
     db.commit()
-    return _redirect(f"/postcards/{postcard_id}")
+    return JSONResponse({"ok": True})
 
 
 @router.post("/postcards/{postcard_id}/mark-sent")
diff --git a/app/templates/postcard_detail.html b/app/templates/postcard_detail.html
index 3788eba..21f0ca8 100644
--- a/app/templates/postcard_detail.html
+++ b/app/templates/postcard_detail.html
@@ -14,9 +14,7 @@
             <button type="submit" class="btn btn-primary" onclick="return confirm('{{ 'pc_detail.confirm_sent'|t(user.language) }}')">{{ 'pc_detail.mark_sent'|t(user.language) }}</button>
         </form>
         {% elif postcard.status == 'sent' %}
-        <form method="post" action="/postcards/{{ postcard.id }}/mark-delivered" class="inline">
-            <button type="submit" class="btn btn-primary" onclick="return confirm('{{ 'pc_detail.confirm_delivered'|t(user.language) }}')">{{ 'pc_detail.mark_delivered'|t(user.language) }}</button>
-        </form>
+        <button type="button" class="btn btn-primary" onclick="if(confirm('{{ 'pc_detail.confirm_delivered'|t(user.language) }}'))fetch('/postcards/{{ postcard.id }}/mark-delivered',{method:'POST'}).then(function(){location.reload();})">{{ 'pc_detail.mark_delivered'|t(user.language) }}</button>
         {% endif %}
         <form method="post" action="/postcards/{{ postcard.id }}/delete" class="inline">
             <button type="submit" class="btn btn-danger" onclick="return confirm('{{ 'pc_detail.confirm_delete'|t(user.language) }}')">{{ 'pc_detail.delete'|t(user.language) }}</button>
diff --git a/app/templates/postcards.html b/app/templates/postcards.html
index d88dba6..72672ed 100644
--- a/app/templates/postcards.html
+++ b/app/templates/postcards.html
@@ -60,9 +60,7 @@
             <button type="submit" class="btn btn-sm btn-primary">{{ 'pc_list.mark_sent'|t(user.language) }}</button>
         </form>
         {% elif pc.status == 'sent' %}
-        <form method="post" action="/postcards/{{ pc.id }}/mark-delivered" onclick="event.preventDefault();event.stopPropagation();if(confirm('{{ 'pc_list.confirm_delivered'|t(user.language) }}'))this.submit();">
-            <button type="submit" class="btn btn-sm btn-primary">{{ 'pc_list.mark_delivered'|t(user.language) }}</button>
-        </form>
+        <button type="button" class="btn btn-sm btn-primary" onclick="event.preventDefault();event.stopPropagation();if(confirm('{{ 'pc_list.confirm_delivered'|t(user.language) }}'))fetch('/postcards/{{ pc.id }}/mark-delivered',{method:'POST'}).then(function(){location.reload();})">{{ 'pc_list.mark_delivered'|t(user.language) }}</button>
         {% endif %}
     </div>
 </a>