diff --git a/linspector/services/dummy.py b/linspector/services/dummy.py
index 6b26a73..583bc2e 100644
--- a/linspector/services/dummy.py
+++ b/linspector/services/dummy.py
@@ -57,7 +57,7 @@ class DummyService(Service):
 
         self.sleep = random.randint(3, 15)
         if "sleep" in args:
-            self.port = args["sleep"]
+            self.sleep = args["sleep"]
 
         self.fail = 0
         if "fail" in args: