diff --git a/o/OpenMPI/OpenMPI-2.1.5-GCC-8.3.0-2.32.eb b/o/OpenMPI/OpenMPI-2.1.5-GCC-8.3.0-2.32.eb
index 05b94c61..01da072f 100644
--- a/o/OpenMPI/OpenMPI-2.1.5-GCC-8.3.0-2.32.eb
+++ b/o/OpenMPI/OpenMPI-2.1.5-GCC-8.3.0-2.32.eb
@@ -18,14 +18,11 @@ dependencies = [
     ('hwloc', '1.11.7')
 ]
 
-# for PBS Pro 13
-preconfigopts = 'export LIBS="-ldl" && '
-
 configopts = '--enable-shared --enable-mpi-thread-multiple --with-verbs '
 # suppress failure modes in relation to mpirun path
 configopts += '--enable-mpirun-prefix-by-default '
 configopts += '--with-hwloc=$EBROOTHWLOC '  # hwloc support
-# configopts += '--disable-dlopen '  # dont disable dlopen!
+configopts += '--disable-dlopen '  # dont disable dlopen!
 # https://github.com/open-mpi/ompi/issues/3630
 configopts += '--with-tm=/opt/pbs/default '  # Enable PBS
 #configopts += '--enable-mpi-java '  # Java support RT#4090