diff --git a/rattail_fabric2/postfix.py b/rattail_fabric2/postfix.py
index 9b768e0..ed17d04 100644
--- a/rattail_fabric2/postfix.py
+++ b/rattail_fabric2/postfix.py
@@ -24,9 +24,8 @@
 Fabric library for Postfix
 """
 
-import shlex
-
 from rattail_fabric2 import apt
+from rattail.util import shlex_join
 
 
 def install(c):
@@ -45,15 +44,15 @@ def alias(c, name, alias_to, path='/etc/aliases'):
     if c.run("grep '^{}:' /etc/aliases".format(name), warn=True).failed:
         # append new entry
         entry = '{}: {}'.format(name, alias_to)
-        echo = shlex.join(['echo', entry])
+        echo = shlex_join(['echo', entry])
         cmd = '{} >> /etc/aliases'.format(echo)
-        cmd = shlex.join(['bash', '-c', cmd])
+        cmd = shlex_join(['bash', '-c', cmd])
         c.sudo(cmd)
     else:
         # update existing entry
         alias_to = alias_to.replace('|', '\\|')
         sub = "s|^{}: .*|{}: {}|".format(name, name, alias_to)
-        cmd = shlex.join(['sed', '-i.bak', '-E', sub, '/etc/aliases'])
+        cmd = shlex_join(['sed', '-i.bak', '-E', sub, '/etc/aliases'])
         c.sudo(cmd)
 
     c.sudo('newaliases')