diff --git a/lib/vpim/vcard.rb b/lib/vpim/vcard.rb
index 0298ef0..0647f1e 100644
--- a/lib/vpim/vcard.rb
+++ b/lib/vpim/vcard.rb
@@ -1,3 +1,5 @@
+# encoding: US-ASCII
+
 =begin
   Copyright (C) 2008 Sam Roberts