diff --git a/config/modbuild.conf b/config/modbuild.conf
index aaaa12a..acdfdf3 100644
--- a/config/modbuild.conf
+++ b/config/modbuild.conf
@@ -4,14 +4,9 @@
 # define PMODULES_ROOT only if it has not been passed as argument
 # to build/install scripts
 #
-
-declare -x PMODULES_ROOT
-declare -x PMODULES_DISTFILESDIR
-declare -x PMODULES_TMPDIR
-
-: ${PMODULES_ROOT:=/opt/psi}
-: ${PMODULES_DISTFILESDIR:=/opt/psi/var/distfiles}
-: ${PMODULES_TMPDIR:=/var/tmp/${USER}}
+: ${PMODULES_ROOT:=/cluster/project/psi/}
+: ${PMODULES_DISTFILESDIR:=/cluster/project/psi/var/distfiles}
+: ${PMODULES_TMPDIR:=/cluster/project/psi/var/tmp}
 
 declare -x PMODULES_CONFIG_DIR='config'
 declare -x PMODULES_MODULEFILES_DIR='modulefiles'
@@ -22,6 +17,9 @@ declare -x PMODULES_DEFAULT_GROUPS='Tools Programming'
 declare -x PMODULES_DEFINED_RELEASES=':unstable:stable:deprecated:'
 declare -x PMODULES_DEFAULT_RELEASES='stable'
 
+export     PMODULES_DISTFILESDIR
+export     PMODULES_TMPDIR
+
 #-----------------------------------------------------------------------------
 # OS specific configuration
 #