diff --git a/check_bandwidth.py b/check_bandwidth.py
index b946a50..590799d 100755
--- a/check_bandwidth.py
+++ b/check_bandwidth.py
@@ -19,6 +19,10 @@ parser.add_argument('--ignore', nargs='*', default=[], help='Interface names to
 parser.add_argument('--ignore-re', default=None, help='Regex matching interface names to ignore.')
 args = parser.parse_args()
 
+# Icinga2 will merge the args to one string
+if len(args.ignore) == 1:
+    args.ignore = args.ignore[0].split(' ')
+
 if args.ignore_re:
     ignore_re = re.compile(args.ignore_re)
 else: