diff --git a/slurm.spec b/slurm.spec
index caa009e..8a8a3c5 100644
--- a/slurm.spec
+++ b/slurm.spec
@@ -122,6 +122,10 @@ ExclusiveArch:  do_not_build
 %define libslurm libslurm%{so_version}
 %{!?_rundir:%define _rundir /var/run}
 
+%if !0%{?_pam_moduledir:1}
+%define _pam_moduledir /%_lib
+%endif
+
 Name:           %{pname}%{?upgrade:%{_ver}}
 Version:        %{ver}
 Release:        0