diff --git a/units.spec b/units.spec
index fb07cbb..fddfa5c 100644
--- a/units.spec
+++ b/units.spec
@@ -1,7 +1,7 @@
 Summary: A utility for converting amounts from one unit to another
 Name: units
 Version: 1.87
-Release: 6%{?dist}
+Release: 7%{?dist}
 Source: ftp://ftp.gnu.org/gnu/units/%{name}-%{version}.tar.gz
 Patch1: units-1.87-gcc-warnings-1.patch
 Patch2: units-1.87-gcc-warnings-2.patch
@@ -11,6 +11,7 @@ Group: Applications/Engineering
 BuildRoot: %{_tmppath}/%{name}-%{version}-%{release}-root-%(%{__id_u} -n)
 Requires(post): /sbin/install-info
 Requires(preun): /sbin/install-info
+BuildRequires: bison
 BuildRequires: ncurses-devel
 BuildRequires: readline-devel
 
@@ -58,6 +59,9 @@ fi
 %{_mandir}/man1/*
 
 %changelog
+* Tue Dec 01 2009 Kamil Dudka <kdudka@redhat.com> - 1.87-7
+- add BuildRequires for bison
+
 * Tue Dec 01 2009 Kamil Dudka <kdudka@redhat.com> - 1.87-6
 - update license to GPLv3+, sanitize specfile
 - fix tons of gcc warnings