diff --git a/exercises/phone-number/phone_number.py b/exercises/phone-number/phone_number.py
index aa23f7533f9..34f9e07b6ad 100644
--- a/exercises/phone-number/phone_number.py
+++ b/exercises/phone-number/phone_number.py
@@ -1,3 +1,3 @@
 class Phone(object):
-    def __init__(self):
+    def __init__(self, number):
         pass