diff --git a/a2ps.spec b/a2ps.spec
index 31a7a08..5081e81 100644
--- a/a2ps.spec
+++ b/a2ps.spec
@@ -41,7 +41,7 @@ BuildRequires: /usr/bin/emacs, gperf, flex, libtool, texinfo, groff
 BuildRequires: ImageMagick
 BuildRequires: groff-perl
 BuildRequires: cups
-BuildRequires: gettext
+BuildRequires: gettext, bison
 BuildRequires: psutils, tetex-dvips, texinfo, tetex-latex
 Url: http://www.inf.enst.fr/~demaille/a2ps/
 BuildRoot: %{_tmppath}/%{name}-%{version}-%{release}-root-%(%{__id_u} -n)
@@ -246,6 +246,7 @@ exit 0
 
 %changelog
 * Thu Mar  8 2007 Tim Waugh <twaugh@redhat.com> 4.13b-62
+- Build requires bison.
 - Use sed instead of perl for string replacement (bug #225235).
 - Better install-info scriptlets (bug #225235).
 - Added BuildRequires and Requires for more packages (bug #225235).