diff --git a/lib/parser-node-list.rb b/lib/parser-node-list.rb
index 10caf4c1..8bbf2701 100644
--- a/lib/parser-node-list.rb
+++ b/lib/parser-node-list.rb
@@ -1,3 +1,5 @@
+# encoding: UTF-8
+
 # Monkeypatch on parser with a list of allowed nodes.
 # Will be pushed upstream once turning out to be correct.
 module Parser