diff --git a/server/routes/tenant.js b/server/routes/tenant.js
index af5c696..eeac267 100644
--- a/server/routes/tenant.js
+++ b/server/routes/tenant.js
@@ -130,8 +130,8 @@ router.post('/logo-upload', authenticateToken, requirePermissions(['branding.edi
       });
     }
 
-    // Get tenant
-    const tenant = await Tenant.findByPk(tenantId);
+    // Get tenant by slug
+    const tenant = await Tenant.findOne({ where: { slug: tenantId } });
     if (!tenant) {
       return res.status(404).json({
         success: false,