diff --git a/bin/runmigration b/bin/runmigration
index b45fabb1..19b7c259 100755
--- a/bin/runmigration
+++ b/bin/runmigration
@@ -35,7 +35,7 @@
 set -e
 
 wait_postgres.sh
-CACHE_DIR=/tmp
+CACHE_DIR=${CACHE_DIR:=/tmp/cachedb}
 
 echo $CACHE_DIR
 
diff --git a/bin/runtests b/bin/runtests
index 4013d7f4..84cf7b8e 100755
--- a/bin/runtests
+++ b/bin/runtests
@@ -30,7 +30,7 @@ set -e
 
 wait_postgres.sh
 LOCAL_SRC_DIR=/odoo/local-src
-CACHE_DIR=/tmp
+CACHE_DIR=${CACHE_DIR:=/tmp/cachedb}
 
 if [ -z $1 ]; then
     LOCAL_ADDONS=$(find ${LOCAL_SRC_DIR}/* -maxdepth 0 -type d -and -not -name server_environment_files -printf "%f\n" |