1 files changed, 13 insertions, 11 deletions
diff --git a/Library/Homebrew/compat/formula_support.rb b/Library/Homebrew/compat/formula_support.rb
index f56a4909b..9cb8d8ff1 100644
--- a/Library/Homebrew/compat/formula_support.rb
+++ b/Library/Homebrew/compat/formula_support.rb
@@ -1,18 +1,20 @@
 require "formula_support"
 
 class KegOnlyReason
-  alias _to_s to_s
+  module Compat
+    def to_s
+      case @reason
+      when :provided_by_osx
+        odeprecated "keg_only :provided_by_osx", "keg_only :provided_by_macos"
+        @reason = :provided_by_macos
+      when :shadowed_by_osx
+        odeprecated "keg_only :shadowed_by_osx", "keg_only :shadowed_by_macos"
+        @reason = :shadowed_by_macos
+      end
 
-  def to_s
-    case @reason
-    when :provided_by_osx
-      odeprecated "keg_only :provided_by_osx", "keg_only :provided_by_macos"
-      @reason = :provided_by_macos
-    when :shadowed_by_osx
-      odeprecated "keg_only :shadowed_by_osx", "keg_only :shadowed_by_macos"
-      @reason = :shadowed_by_macos
+      super
     end
-
-    _to_s
   end
+
+  prepend Compat
 end