diff --git a/check_bandwidth.py b/check_bandwidth.py
index 6064135..5f716f0 100755
--- a/check_bandwidth.py
+++ b/check_bandwidth.py
@@ -8,15 +8,15 @@ import psutil
 import checker.nagios as nagios
 from checker.markdown import list_to_markdown_table
 
-# Parse the bandwidth limit argument
 parser = argparse.ArgumentParser(description='Check network interface bandwidth utilization.')
 parser.add_argument('--bandwidth', type=float, required=True, help='Bandwidth speed in Mbps.')
 parser.add_argument('--critical', type=int, default=75, help='Critical if percent of bandwidth usage is greater than or equal to this.')
 parser.add_argument('--warn', type=int, default=50, help='Warning if percent of bandwidth usage is greater than or equal to this.')
 parser.add_argument('--max', type=int, default=None, help='Set the max value the bandwidth can be. Useful for graphs and whatever.')
-parser.add_argument('--ignore', nargs='*', default=[], help='Interface names to ignore.')
+parser.add_argument('--ignore', default=None, help='Interface names to ignore.')
 args = parser.parse_args()
 
+ignore_interfaces = args.ignore.split(',') if args.ignore else []
 
 def main():
     data = []
@@ -28,7 +28,7 @@ def main():
 
     # Calculate bandwidth utilization for each interface
     for interface, stats in net_io_counters.items():
-        if interface in args.ignore:
+        if interface in ignore_interfaces:
             continue
         # Get the number of bytes sent and received
         bytes_sent = stats.bytes_sent