diff --git a/opensm.spec b/opensm.spec
index 3aa72c8..c098c18 100644
--- a/opensm.spec
+++ b/opensm.spec
@@ -11,7 +11,7 @@ Source2: opensm.logrotate
 Source3: opensm.initd
 Patch0:  opensm-3.2.1-rpath.patch
 BuildRoot: %{_tmppath}/%{name}-%{version}-%{release}-root-%(%{__id_u} -n)
-BuildRequires: libibmad-devel >= 1.2.0, libtool
+BuildRequires: libibmad-devel >= 1.2.0, libtool, bison, flex, byacc
 Requires: %{name}-libs = %{version}-%{release}, logrotate, rdma
 
 %description