1 files changed, 12 insertions, 6 deletions
diff --git a/activesupport/lib/active_support/string_inquirer.rb b/activesupport/lib/active_support/string_inquirer.rb
index f3f3909a90..5f20bfa7bc 100644
--- a/activesupport/lib/active_support/string_inquirer.rb
+++ b/activesupport/lib/active_support/string_inquirer.rb
@@ -10,12 +10,18 @@ module ActiveSupport
   #   Rails.env.production?
   #
   class StringInquirer < String
-    def method_missing(method_name, *arguments)
-      if method_name[-1, 1] == "?"
-        self == method_name[0..-2]
-      else
-        super
+    private
+
+      def respond_to_missing?(method_name, include_private = false)
+        method_name[-1] == '?'
+      end
+
+      def method_missing(method_name, *arguments)
+        if method_name[-1] == '?'
+          self == method_name[0..-2]
+        else
+          super
+        end
       end
-    end
   end
 end