diff --git a/spec/tokenizer_spec.rb b/spec/tokenizer_spec.rb
index fba7c318..8f39707a 100644
--- a/spec/tokenizer_spec.rb
+++ b/spec/tokenizer_spec.rb
@@ -1,4 +1,5 @@
 require "spec_helper"
+require "timeout"
 
 describe "Tokenizer" do
   let(:parser) { @context["handlebars"] }