diff --git a/os_loganalyze/filter.py b/os_loganalyze/filter.py
index b525134..04a4699 100644
--- a/os_loganalyze/filter.py
+++ b/os_loganalyze/filter.py
@@ -23,7 +23,7 @@ import os_loganalyze.util as util
 # which logs support severity
 SUPPORTS_SEV = re.compile(
     r'/'  # this uses an re.search so anchor the string
-    r'((screen-)?(n-|c-|g-|h-|ir-|ironic-|m-|o-|'
+    r'((screen-)?(n-|c-|g-|h-|ir-|ironic-|m-|o-|df-|'
     r'q-|neutron-|'  # support both lib/neutron and lib/neutron-legacy logs
     r'ceil|key|sah|des|tr)'  # openstack logs
     r'|(devstack\@)'  # systemd logs