diff --git a/fog.gemspec b/fog.gemspec
index 132374e57..023683385 100644
--- a/fog.gemspec
+++ b/fog.gemspec
@@ -80,6 +80,7 @@ Gem::Specification.new do |s|
   s.add_development_dependency("rbvmomi")
   s.add_development_dependency("rubocop") if RUBY_VERSION > "1.9"
   s.add_development_dependency("shindo", "~> 0.3.4")
+  s.add_development_dependency("simplecov")
   s.add_development_dependency("thor")
   s.add_development_dependency("yard")
 
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index 7b08dd1dd..17dc3edb6 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -1,3 +1,11 @@
+if ENV["COVERAGE"]
+  require "simplecov"
+
+  SimpleCov.start do
+    add_filter "/spec/"
+  end
+end
+
 require "minitest/autorun"
 require "minitest/spec"
 require "minitest/stub_const"