diff --git a/letsencrypt/cli.py b/letsencrypt/cli.py
index 7791d2819..533539684 100644
--- a/letsencrypt/cli.py
+++ b/letsencrypt/cli.py
@@ -1202,7 +1202,7 @@ class HelpfulArgumentParser(object):
             _process_domain(parsed_args, d)
 
         for d in domains:
-            sanitised = le_util.enforce_domain_sanity(d):
+            sanitised = le_util.enforce_domain_sanity(d)
             if d.lower() != sanitised:
                 raise errors.ConfigurationError(
                     "CSR domain {0} needs to be sanitised to {1}.".format(d, sanitised))