diff --git a/powerdns_api_proxy/proxy.py b/powerdns_api_proxy/proxy.py
index 5016667..37de012 100644
--- a/powerdns_api_proxy/proxy.py
+++ b/powerdns_api_proxy/proxy.py
@@ -75,6 +75,7 @@ async def _startup(app: FastAPI):
     logger.info('Enabling metrics')
     instrumentator.add(metrics.default())
     instrumentator.add(http_requests_total_environment())
+    instrumentator.instrument(app)
 
     if config.metrics_require_auth:
         logger.info('Enabling metrics authentication')