diff --git a/.profile.linux b/.profile.linux
index 6a0ee34..f1d2007 100644
--- a/.profile.linux
+++ b/.profile.linux
@@ -1 +1 @@
-[ -z  "$XDG_RUNTIME_DIR" ] && export XDG_RUNTIME_DIR=/tmp/runtime-`id -u`
+export XDG_RUNTIME_DIR=${XDG_RUNTIME_DIR:-/tmp/runtime-`id -u`}