diff --git a/os_loganalyze/filter.py b/os_loganalyze/filter.py
index 411db71..8e1d0c7 100644
--- a/os_loganalyze/filter.py
+++ b/os_loganalyze/filter.py
@@ -19,7 +19,7 @@ import re
 
 # which logs support severity
 SUPPORTS_SEV = re.compile(
-    '(screen-(n-|c-|q-|g-|h-|ir-|ceil|key|sah|des|tr)'  # openstack screen logs
+    '((screen-)?(n-|c-|q-|g-|h-|ir-|ceil|key|sah|des|tr)'  # openstack logs
     '|(keystone|tempest)\.txt|syslog)')  # other things we understand
 
 SYSLOGDATE = '\w+\s+\d+\s+\d{2}:\d{2}:\d{2}'