diff --git a/lib/related.rb b/lib/related.rb
index 77e353c..04e958a 100644
--- a/lib/related.rb
+++ b/lib/related.rb
@@ -1,6 +1,7 @@
 require 'redis'
 require 'redis/namespace'
 require 'active_model'
+require 'activemodel-serializers-xml'
 
 require 'related/version'
 require 'related/helpers'
@@ -51,4 +52,4 @@ def redis
     self.redis
   end
 
-end
\ No newline at end of file
+end
diff --git a/related.gemspec b/related.gemspec
index bad6875..d209395 100644
--- a/related.gemspec
+++ b/related.gemspec
@@ -24,4 +24,5 @@ Gem::Specification.new do |s|
   s.add_dependency('redis',  '> 2.0.0')
   s.add_dependency('redis-namespace',  '> 0.8.0')
   s.add_dependency('activemodel')
-end
\ No newline at end of file
+  s.add_dependency('activemodel-serializers-xml')
+end