diff --git a/meta/recipes-core/glib-2.0/glib-2.0/run-ptest b/meta/recipes-core/glib-2.0/glib-2.0/run-ptest
index c476d67310..831bc3b91f 100644
--- a/meta/recipes-core/glib-2.0/glib-2.0/run-ptest
+++ b/meta/recipes-core/glib-2.0/glib-2.0/run-ptest
@@ -6,5 +6,5 @@ if id -u glib2-test; then
 fi
 useradd glib2-test
 cd /tmp
-su glib2-test -c 'gnome-desktop-testing-runner glib'
+su glib2-test -c 'G_TEST_TMPDIR=`readlink -f /tmp` gnome-desktop-testing-runner glib'
 userdel glib2-test