diff --git a/Gemfile b/Gemfile
index 42a0a8a2..649e912e 100644
--- a/Gemfile
+++ b/Gemfile
@@ -7,11 +7,18 @@ platforms :ruby do
   gem 'sqlite3'
 end
 
+platforms :mri do
+  gem 'coveralls', :require => false
+  gem 'simplecov', :require => false
+end
+
 platforms :jruby do
   gem 'activerecord-jdbcsqlite3-adapter'
 end
 
-gem 'coveralls', :require => false
-gem 'simplecov', :require => false
+platforms :rbx do
+  gem 'rubysl', '~> 2.0'
+  gem 'racc', '~> 1.4.10'
+end
 
 gem 'rails', "~> 4.0.0"
diff --git a/Gemfile.edge b/Gemfile.edge
index 574d5746..b9812bb7 100644
--- a/Gemfile.edge
+++ b/Gemfile.edge
@@ -6,12 +6,19 @@ platforms :ruby do
   gem 'sqlite3'
 end
 
+platforms :mri do
+  gem 'coveralls', :require => false
+  gem 'simplecov', :require => false
+end
+
 platforms :jruby do
   gem 'activerecord-jdbcsqlite3-adapter'
 end
 
-gem 'coveralls', :require => false
-gem 'simplecov', :require => false
+platforms :rbx do
+  gem 'rubysl', '~> 2.0'
+  gem 'racc', '~> 1.4.10'
+end
 
 # Use Rails master
 gem 'rails', github: 'rails/rails'
diff --git a/Gemfile.rails3 b/Gemfile.rails3
index 988ac10a..b349e692 100644
--- a/Gemfile.rails3
+++ b/Gemfile.rails3
@@ -8,12 +8,19 @@ platforms :ruby do
   gem 'sqlite3'
 end
 
+platforms :mri do
+  gem 'coveralls', :require => false
+  gem 'simplecov', :require => false
+end
+
 platforms :jruby do
   gem 'activerecord-jdbcsqlite3-adapter'
 end
 
-gem 'coveralls', :require => false
-gem 'simplecov', :require => false
+platforms :rbx do
+  gem 'rubysl', '~> 2.0'
+  gem 'racc', '~> 1.4.10'
+end
 
 gem 'minitest', '~> 4.0'
 gem 'rails', '~> 3.2'
diff --git a/test/coverage_setup.rb b/test/coverage_setup.rb
index 7fe12c67..4d11bcec 100644
--- a/test/coverage_setup.rb
+++ b/test/coverage_setup.rb
@@ -1,12 +1,15 @@
-require 'simplecov'
-require 'coveralls'
+begin
+  require 'simplecov'
+  require 'coveralls'
 
-SimpleCov.formatter = SimpleCov::Formatter::MultiFormatter[
-  SimpleCov::Formatter::HTMLFormatter,
-  Coveralls::SimpleCov::Formatter
-]
+  SimpleCov.formatter = SimpleCov::Formatter::MultiFormatter[
+    SimpleCov::Formatter::HTMLFormatter,
+    Coveralls::SimpleCov::Formatter
+  ]
 
-SimpleCov.start do
-  add_group "lib", "lib"
-  add_group "test", "test"
+  SimpleCov.start do
+    add_group "lib", "lib"
+    add_group "test", "test"
+  end
+rescue LoadError
 end