diff --git a/lib/rbs/cli.rb b/lib/rbs/cli.rb
index c645c2deb..166a85184 100644
--- a/lib/rbs/cli.rb
+++ b/lib/rbs/cli.rb
@@ -1158,7 +1158,7 @@ def run_collection(args, options)
           stderr.puts "#{lock_path} should exist to clean"
           return 1
         end
-        Collection::Cleaner.new(lockfile_path: lock_path)
+        Collection::Cleaner.new(lockfile_path: lock_path).clean
       when 'help', 'hel', 'he', 'h'
         stdout.puts opts.help
       else