diff --git a/doc/Makefile.am b/doc/Makefile.am
index c45b8fc7..edfcaaa6 100644
--- a/doc/Makefile.am
+++ b/doc/Makefile.am
@@ -1,5 +1,4 @@
 ## Process this file with automake to produce Makefile.in -*-Makefile-*-
-AUTOMAKE_OPTIONS = 1.4
 
 info_TEXINFOS = bison.texinfo
 man_MANS = bison.1