diff --git a/udev/udev-qubes-block.rules b/udev/udev-qubes-block.rules
index 77ea1ae..9fc0cbd 100644
--- a/udev/udev-qubes-block.rules
+++ b/udev/udev-qubes-block.rules
@@ -12,6 +12,7 @@ ENV{MAJOR}=="202", GOTO="qubes_block_end"
 
 # Skip device-mapper devices
 ENV{MAJOR}=="253", ENV{DM_NAME}=="snapshot-*", GOTO="qubes_block_end"
+ENV{MAJOR}=="253", ENV{DM_NAME}=="", GOTO="qubes_block_end"
 
 IMPORT{db}="QUBES_EXPOSED"
 ACTION=="add", IMPORT{program}="/usr/bin/flock /var/run/qubes-udev.lock -c /usr/libexec/qubes/udev-block-add-change"