diff --git a/src/ohmyapi/core/runtime.py b/src/ohmyapi/core/runtime.py
index 9a920f8..0b110f8 100644
--- a/src/ohmyapi/core/runtime.py
+++ b/src/ohmyapi/core/runtime.py
@@ -95,6 +95,7 @@ class Project:
         Attach project middlewares and routes and event handlers to given
         FastAPI instance.
         """
+        app.router.prefix = getattr(self.settings, "API_PREFIX", "")
         # Attach project middlewares and routes.
         for app_name, app_def in self._apps.items():
             for middleware, kwargs in app_def.middlewares: