diff --git a/parser.ypp b/parser.ypp
index 2afbcac..baa9cab 100644
--- a/parser.ypp
+++ b/parser.ypp
@@ -7,8 +7,6 @@
* of patent rights can be found in the PATENTS file in the same directory.
*/
-%require "3"
-
%skeleton "lalr1.cc"
%defines