diff --git a/filter_files.py b/filter_files.py
index 746f61c..4052b1a 100644
--- a/filter_files.py
+++ b/filter_files.py
@@ -1,5 +1,5 @@
 import sys
 
 if __name__ == "__main__":
-  files = argv[0]
+  files = sys.argv[0]
   print(files)