diff --git a/letsencrypt/scripts/main.py b/letsencrypt/scripts/main.py
index e3fe74035..e0c2d4ce8 100755
--- a/letsencrypt/scripts/main.py
+++ b/letsencrypt/scripts/main.py
@@ -9,6 +9,7 @@ import logging
 import os
 import sys
 
+import confargparse
 import zope.component
 import zope.interface
 
@@ -22,7 +23,7 @@ from letsencrypt.client import log
 
 def create_parser():
     """Create parser."""
-    parser = argparse.ArgumentParser(
+    parser = confargparse.ConfArgParser(
         description="letsencrypt client %s" % letsencrypt.__version__)
 
     add = parser.add_argument
diff --git a/setup.py b/setup.py
index 5501c7dd6..0d4f58922 100755
--- a/setup.py
+++ b/setup.py
@@ -23,6 +23,7 @@ changes = read_file(os.path.join(here, 'CHANGES.rst'))
 
 install_requires = [
     'argparse',
+    'ConfArgParse',
     'jsonschema',
     'mock',
     'pycrypto',