diff --git a/Library/Homebrew/dev-cmd/audit.rb b/Library/Homebrew/dev-cmd/audit.rb
index 3c190176304116baa75f5a206f76ccc0e79a59da..568051b43685e057392cf1325eff68e976691024 100644
--- a/Library/Homebrew/dev-cmd/audit.rb
+++ b/Library/Homebrew/dev-cmd/audit.rb
@@ -741,7 +741,7 @@ class FormulaAuditor
     end
     bin_names.each do |name|
       ["system", "shell_output", "pipe_output"].each do |cmd|
-        if text =~ /(def test|test do).*#{cmd}[\(\s]+['"]#{name}[\s'"]/m
+        if text =~ /(def test|test do).*#{cmd}[\(\s]+['"]#{Regexp.escape name}[\s'"]/m
           problem %(fully scope test #{cmd} calls e.g. #{cmd} "\#{bin}/#{name}")
         end
       end