diff --git a/tests/clitest.py b/tests/clitest.py
index e3ecfce5..1e767ee9 100644
--- a/tests/clitest.py
+++ b/tests/clitest.py
@@ -652,6 +652,7 @@ c.add_invalid("--disk path=%(NEWIMG1)s,format=qcow2,size=.0000001")  # Unmanaged
 c.add_invalid("--disk path=%(MANAGEDDISKNEW1)s,format=raw,size=.0000001")  # Managed disk using any format
 c.add_invalid("--disk %(NEWIMG1)s")  # Not specifying path= and non existent storage w/ no size
 c.add_invalid("--disk %(COLLIDE)s")  # Colliding storage without --force
+c.add_invalid("--disk /dev/default-pool/backing.img")  # Colliding storage via backing store
 c.add_invalid("--disk %(DIR)s,device=cdrom")  # Dir without floppy
 c.add_invalid("--disk %(EXISTIMG1)s,driver_name=foobar,driver_type=foobaz")  # Unknown driver name and type options (as of 1.0.0)