diff --git a/router.py b/router.py
index 7c34f2d..2f01a01 100644
--- a/router.py
+++ b/router.py
@@ -167,7 +167,7 @@ class Router(IoHandler):
                 return
         except Exception as e:
             msg = f'error in request: {e!r}'
-            self.service.failures[service.port] = msg
+            self.service.failures[self.service.port] = msg
             log.error(msg)
         self.close()