diff --git a/Library/Homebrew/extend/os/mac/missing_formula.rb b/Library/Homebrew/extend/os/mac/missing_formula.rb
index 5e4879b728..81f71ac004 100644
--- a/Library/Homebrew/extend/os/mac/missing_formula.rb
+++ b/Library/Homebrew/extend/os/mac/missing_formula.rb
@@ -13,6 +13,17 @@ module Homebrew
           generic_blacklisted_reason(name)
         end
       end
+
+      def cask_reason(name, silent: false, show_info: false)
+        return if silent
+
+        cask = Cask::CaskLoader.load(name)
+        reason = +"Found a cask named \"#{name}\" instead.\n"
+        reason << Cask::Cmd::Info.get_info(cask) if show_info
+        reason.freeze
+      rescue Cask::CaskUnavailableError
+        nil
+      end
     end
   end
 end
diff --git a/Library/Homebrew/missing_formula.rb b/Library/Homebrew/missing_formula.rb
index 7fe246c338..27545e7c90 100644
--- a/Library/Homebrew/missing_formula.rb
+++ b/Library/Homebrew/missing_formula.rb
@@ -196,16 +196,7 @@ module Homebrew
         end
       end
 
-      def cask_reason(name, silent: false, show_info: false)
-        return if silent
-
-        cask = Cask::CaskLoader.load(name)
-        reason = +"Found a cask named \"#{name}\" instead.\n"
-        reason << Cask::Cmd::Info.get_info(cask) if show_info
-        reason.freeze
-      rescue Cask::CaskUnavailableError
-        nil
-      end
+      def cask_reason(name, silent: false, show_info: false); end
 
       require "extend/os/missing_formula"
     end