diff --git a/spec/spec_system_helper.rb b/spec/spec_system_helper.rb
index 08ccc48c..6c906e3b 100644
--- a/spec/spec_system_helper.rb
+++ b/spec/spec_system_helper.rb
@@ -67,6 +67,7 @@ def deploy_gem
                               %Q{gem "diy"},
                               %Q{gem "thor"},
                               %Q{gem "deep_merge"},
+                              %Q{gem "unicode-display_width"},
                               %Q{gem "ceedling", :path => '#{git_repo}'}
                             ].join("\n")