diff --git a/gamutrf/waterfall.py b/gamutrf/waterfall.py
index 5198a25c..d5cc36d4 100644
--- a/gamutrf/waterfall.py
+++ b/gamutrf/waterfall.py
@@ -737,7 +737,7 @@ def main():
         save_path,
         args.save_time,
         detection_type,
-        args.scanner,
+        args.scanners,
     )