diff --git a/letsencrypt/client/apache/parser.py b/letsencrypt/client/apache/parser.py
index 6bfb1d27c..dc8c3ece6 100644
--- a/letsencrypt/client/apache/parser.py
+++ b/letsencrypt/client/apache/parser.py
@@ -78,9 +78,9 @@ class ApacheParser(object):
         """
         self.aug.set(aug_conf_path + "/directive[last() + 1]", directive)
         if isinstance(arg, list):
-            for i, x in enumerate(arg, 1):
+            for i, value in enumerate(arg, 1):
                 self.aug.set(
-                    "%s/directive[last()]/arg[%d]" % (aug_conf_path, i), x)
+                    "%s/directive[last()]/arg[%d]" % (aug_conf_path, i), value)
         else:
             self.aug.set(aug_conf_path + "/directive[last()]/arg", arg)