diff --git a/decide/mixnet/mixcrypt.py b/decide/mixnet/mixcrypt.py
index e1e1c98e34..34212339da 100644
--- a/decide/mixnet/mixcrypt.py
+++ b/decide/mixnet/mixcrypt.py
@@ -45,7 +45,7 @@
 def rand(p):
     while True:
         k = random.StrongRandom().randint(1, int(p) - 1)
-        if GCD(k, p - 1) == 1: break
+        if GCD(k, int(p) - 1) == 1: break
     return k