1 files changed, 1 insertions, 0 deletions
diff --git a/Gemfile b/Gemfile
index 2fdcec062c..4bdb5a4986 100644
--- a/Gemfile
+++ b/Gemfile
@@ -60,6 +60,7 @@ instance_eval File.read local_gemfile if File.exist? local_gemfile
 group :test do
   # FIX: Our test suite isn't ready to run in random order yet
   gem 'minitest', '< 5.3.4'
+  gem 'method_source'
 
   platforms :mri_19 do
     gem 'ruby-prof', '~> 0.11.2'