diff --git a/src/pricehist/cli.py b/src/pricehist/cli.py
index d845bf0..634d811 100644
--- a/src/pricehist/cli.py
+++ b/src/pricehist/cli.py
@@ -10,13 +10,13 @@ from pricehist.format import Format
 from pricehist.series import Series
 
 
-def cli(args=None, output_file=sys.stdout):
+def cli(argv=sys.argv, output_file=sys.stdout):
     start_time = datetime.now()
 
     logger.init()
 
     parser = build_parser()
-    args = parser.parse_args()
+    args = parser.parse_args(argv[1:])
 
     if args.verbose:
         logger.show_debug()