diff --git a/etc/settings.sh b/etc/settings.sh
index cdf1338d6..e85bf95e8 100644
--- a/etc/settings.sh
+++ b/etc/settings.sh
@@ -245,6 +245,8 @@ MACPORTOPENMPI)
        # include files and libraries.
        export MPI_ARCH_PATH="${libDir%/*}"
 
+       export FOAM_MPI_LIBBIN=$FOAM_LIBBIN/$mpi_version
+
        _foamAddLib     $libDir
        unset libDir
        ;;