diff --git a/Library/Homebrew/extend/os/mac/diagnostic.rb b/Library/Homebrew/extend/os/mac/diagnostic.rb
index 4da59bc2f3..c7dabde2b9 100644
--- a/Library/Homebrew/extend/os/mac/diagnostic.rb
+++ b/Library/Homebrew/extend/os/mac/diagnostic.rb
@@ -54,7 +54,7 @@ module Homebrew
         return unless MacOS::Xcode.outdated?
 
         # Travis CI images are going to end up outdated so don't complain when
-        # `brew test-bot` runs `brew doctor` in the CI for the Homebrew/brew 
+        # `brew test-bot` runs `brew doctor` in the CI for the Homebrew/brew
         # repository. This only needs to support whatever CI provider
         # Homebrew/brew is currently using.
         return if ENV["TRAVIS"]