diff --git a/tools/apps/update_homebrew/lib/update_homebrew.dart b/tools/apps/update_homebrew/lib/update_homebrew.dart
index 3db0e68..2e251bb 100644
--- a/tools/apps/update_homebrew/lib/update_homebrew.dart
+++ b/tools/apps/update_homebrew/lib/update_homebrew.dart
@@ -234,7 +234,7 @@
   def shim_script(target)
     <<~EOS
       #!/usr/bin/env bash
-      exec "#{prefix}/#{target}" "$@"
+      exec "#{prefix}/#{target}" "\$@"
     EOS
   end
 
@@ -258,7 +258,6 @@
 end
 ''';
 
-
 Future runGit(List<String> args, String repository,
     Map<String, String> gitEnvironment) async {
   print("git ${args.join(' ')}");