diff --git a/Gemfile b/Gemfile
index 06e858e4..476d7682 100644
--- a/Gemfile
+++ b/Gemfile
@@ -31,3 +31,8 @@ end
 
 # Windows does not include zoneinfo files, so bundle the tzinfo-data gem
 gem 'tzinfo-data', platforms: (@windows_platforms + [:jruby])
+
+# JRuby versions before 9.x report their version as "1.9.x" or lower, so lock these to an older version of mime-types
+if defined?(JRUBY_VERSION) and Gem::ruby_version < Gem::Version.new("2.0.0")
+  gem 'mime-types', '< 3'
+end
diff --git a/lib/active_model/serializer.rb b/lib/active_model/serializer.rb
index ef47178b..694cf61f 100644
--- a/lib/active_model/serializer.rb
+++ b/lib/active_model/serializer.rb
@@ -294,9 +294,7 @@ module ActiveModel
 
       scope_name = @options[:scope_name]
       if scope_name && !respond_to?(scope_name)
-        self.class.class_eval do
-          define_method scope_name, lambda { scope }
-        end
+        self.singleton_class.send :alias_method, scope_name, :scope
       end
     end