diff --git a/Utilities/for_fastas/Cluster.py b/Utilities/for_fastas/Cluster.py
index c6b40ef..982c527 100644
--- a/Utilities/for_fastas/Cluster.py
+++ b/Utilities/for_fastas/Cluster.py
@@ -58,7 +58,7 @@ def main():
     elif args.type == 'dna':
         identity = input_validation(args.identity, 'ERROR! Use format 0.## for DNA sequence identity threshold.')
         overlap = input_validation(args.overlap, 'ERROR! Use format 0.## for DNA sequence alignment overlap value.')
-        cluster_sequences('cd-hit-est', identity, overlap, args.input, args.output)
+        cluster_sequences('cd-hit-est', identity, overlap, args.input_files, args.output)
     else:
         print('Invalid sequence type. Choose "aa" for Amino Acids or "dna" for DNA.')
         exit(1)