diff --git a/lib/jbuilder/jbuilder_template.rb b/lib/jbuilder/jbuilder_template.rb
index 1daed980..abf67e1a 100644
--- a/lib/jbuilder/jbuilder_template.rb
+++ b/lib/jbuilder/jbuilder_template.rb
@@ -9,9 +9,9 @@ def partial!(options, locals = {})
     when ::Hash
       options[:locals] ||= {}
       options[:locals].merge!(:json => self)
-      @context.render(options.reverse_merge(:formats => [:json]))
+      @context.render(options.reverse_merge(:handlers => [:jbuilder]))
     else # String
-      @context.render(:partial => options, :locals => locals.merge(:json => self), :formats => [:json])
+      @context.render(:partial => options, :locals => locals.merge(:json => self), :handlers => [:jbuilder])
     end
   end