diff --git a/pacemaker.spec b/pacemaker.spec
index 04f913c..9cec38f 100644
--- a/pacemaker.spec
+++ b/pacemaker.spec
@@ -299,6 +299,8 @@ Requires:       %{name}-cluster-libs = %{version}-%{release}
 # builds; this is supposed to be disabled for shipping code.
 Requires:       pacemaker
 %endif
+Conflicts:      libpacemaker-devel < 2.1.3
+Obsoletes:      libpacemaker-devel < 2.1.3
 
 %description devel
 Pacemaker is an advanced, scalable High-Availability cluster resource