diff --git a/Library/Contributions/cmd/brew-test-bot.rb b/Library/Contributions/cmd/brew-test-bot.rb
index 73ea34c4d3..3d997474a2 100755
--- a/Library/Contributions/cmd/brew-test-bot.rb
+++ b/Library/Contributions/cmd/brew-test-bot.rb
@@ -474,7 +474,7 @@ if ARGV.include? "--junit"
       failure = testcase.add_element 'failure' if step.failed?
       if step.has_output?
         # Remove invalid XML CData characters from step output.
-        output = REXML::CData.new step.output.delete(/\000\f\e/)
+        output = REXML::CData.new step.output.delete("\000\f\e")
         if step.passed?
           system_out = testcase.add_element 'system-out'
           system_out.text = output