diff --git a/server/api_server/openapi/swagger.html b/server/api_server/openapi/swagger.html
index 441758b9..503083d5 100644
--- a/server/api_server/openapi/swagger.html
+++ b/server/api_server/openapi/swagger.html
@@ -16,7 +16,8 @@
   <script>
     window.onload = () => {
       window.ui = SwaggerUIBundle({
-        url: '/openapi.json',
+        // Use a relative path so the UI works whether served at /docs or /server/docs
+        url: 'openapi.json',
         dom_id: '#swagger-ui',
         deepLinking: true,
         presets: [