diff --git a/Rakefile b/Rakefile
index abfe8c1..72b4038 100644
--- a/Rakefile
+++ b/Rakefile
@@ -12,7 +12,7 @@ end
 task :default => :spec
 
 namespace :spec do
-  %w(active_record_32 data_mapper_12 mongoid_24 mongo_mapper sinatra).each do |gemfile|
+  %w(active_record_32 active_record_31 data_mapper_12 mongoid_24 mongo_mapper sinatra).each do |gemfile|
     task gemfile do
       sh "BUNDLE_GEMFILE='gemfiles/#{gemfile}.gemfile' bundle --quiet"
       sh "BUNDLE_GEMFILE='gemfiles/#{gemfile}.gemfile' bundle exec rake -t spec"
@@ -20,7 +20,7 @@ namespace :spec do
   end
 
   task :all do
-    %w(active_record_32 data_mapper_12 mongoid_24 mongo_mapper sinatra).each do |gemfile|
+    %w(active_record_32 active_record_31 data_mapper_12 mongoid_24 mongo_mapper sinatra).each do |gemfile|
       sh "BUNDLE_GEMFILE='gemfiles/#{gemfile}.gemfile' bundle --quiet"
       sh "BUNDLE_GEMFILE='gemfiles/#{gemfile}.gemfile' bundle exec rake spec"
     end
diff --git a/gemfiles/active_record_31.gemfile b/gemfiles/active_record_31.gemfile
new file mode 100644
index 0000000..8771d32
--- /dev/null
+++ b/gemfiles/active_record_31.gemfile
@@ -0,0 +1,7 @@
+source :rubygems
+
+gem 'railties', '>= 3.1.5'
+gem 'activerecord', '>= 3.1.5', :require => 'active_record'
+gem 'rspec-rails', '>= 2.0'
+
+gemspec :path => '../'