diff --git a/workflow/scripts/convert_reads.py b/workflow/scripts/convert_reads.py
index 4c89170622941cffe76bceac4218132918047ea7..dc3756a5315376d97382b4c4679bcdf7b25bc765 100644
--- a/workflow/scripts/convert_reads.py
+++ b/workflow/scripts/convert_reads.py
@@ -45,7 +45,7 @@ def get_args():
                         default=True,
                         action='store_true')
 
-    parser.add_argument('-t', '--tn5'
+    parser.add_argument('-t', '--tn5',
                     help='Enable TN5 shifting for ATAC-Seq.'
                     default=True,
                     action='store_true')