diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index e048e5c..b29eea1 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -15,7 +15,12 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 #
+require 'coveralls'
 require 'simplecov'
+SimpleCov.formatter = SimpleCov::Formatter::MultiFormatter[
+  SimpleCov::Formatter::HTMLFormatter,
+  Coveralls::SimpleCov::Formatter
+]
 SimpleCov.start
 
 require 'github_changelog_generator'