diff --git a/test/iscsi_tgt/rbd/rbd.sh b/test/iscsi_tgt/rbd/rbd.sh
index 460900ed0..a6fb54cb4 100755
--- a/test/iscsi_tgt/rbd/rbd.sh
+++ b/test/iscsi_tgt/rbd/rbd.sh
@@ -4,6 +4,11 @@ testdir=$(readlink -f $(dirname $0))
 rootdir=$(readlink -f $testdir/../../..)
 source $rootdir/scripts/autotest_common.sh
 
+if [ -z $CEPH_DIR ]; then
+	echo "Ceph directory not defined; skipping RBD tests"
+	exit 0
+fi
+
 if [ ! -d $CEPH_DIR ]; then
 	echo "Ceph directory not detected on this system; skipping RBD tests"
 	exit 0