diff --git a/src/pve_exporter/cli.py b/src/pve_exporter/cli.py
index 445bd2e..05ce2d0 100755
--- a/src/pve_exporter/cli.py
+++ b/src/pve_exporter/cli.py
@@ -1,35 +1,34 @@
 """
 Proxmox VE exporter for the Prometheus monitoring system.
 """
 
-import sys
 from argparse import ArgumentParser
 
 import yaml
 from pve_exporter.http import start_http_server
 from pve_exporter.config import config_from_yaml
 
 
-def main(args=None):
+def main():
     """
     Main entry point.
     """
 
     parser = ArgumentParser()
     parser.add_argument('config', nargs='?', default='pve.yml',
                         help='Path to configuration file (pve.yml)')
     parser.add_argument('port', nargs='?', type=int, default='9221',
                         help='Port on which the exporter is listening (9221)')
     parser.add_argument('address', nargs='?', default='',
                         help='Address to which the exporter will bind')
 
-    params = parser.parse_args(args if args is None else sys.argv[1:])
+    params = parser.parse_args()
 
     # Load configuration.
     with open(params.config) as handle:
         config = config_from_yaml(yaml.safe_load(handle))
 
     if config.valid:
         start_http_server(config, params.port, params.address)
     else:
         parser.error(str(config))