diff --git a/cryptools/rsa.py b/cryptools/rsa.py
index 9fb5e7f..889550d 100755
--- a/cryptools/rsa.py
+++ b/cryptools/rsa.py
@@ -99,7 +99,7 @@ def random_prime(bits):
 # - http://inaz2.hatenablog.com/entry/2016/01/15/011138
 
 
-def low_public_exponent_attack(c, e):
+def low_public_exponent_attack(c, n, e):
     bound = root(n, e)[0]
     m = root(c, e)[0]
     return m, bound