diff --git a/Library/Homebrew/formula.rb b/Library/Homebrew/formula.rb
index 889b6b6f58..1bfd73a0e2 100644
--- a/Library/Homebrew/formula.rb
+++ b/Library/Homebrew/formula.rb
@@ -4216,7 +4216,7 @@ class Formula
         lambda do |_|
           on_macos do
             T.bind(self, PourBottleCheck)
-            reason(<<~EOS)
+            reason(+<<~EOS)
               The bottle needs the Xcode Command Line Tools to be installed at /Library/Developer/CommandLineTools.
               Development tools provided by Xcode.app are not sufficient.