diff --git a/pyghmi/ipmi/events.py b/pyghmi/ipmi/events.py
index 2df47954..fde1b93c 100644
--- a/pyghmi/ipmi/events.py
+++ b/pyghmi/ipmi/events.py
@@ -123,6 +123,7 @@ slot_types = {
     9: 'PCIe',
     10: 'SCSI',
     11: 'SATA/SAS',
+    12: 'USB',
 }
 
 power_states = {
@@ -251,7 +252,7 @@ def decode_eventdata(sensor_type, offset, eventdata, sdr):
         return 'Requested {0] while {1}'.format(eventdata[1], eventdata[2])
     elif sensor_type == 0x1d and offset == 7:
         return restart_causes.get(eventdata[1], 'Unknown')
-    elif sensor_type == 0x21 and offset == 0x9:
+    elif sensor_type == 0x21:
         return '{0} {1}'.format(slot_types.get(eventdata[1], 'Unknown'),
                                 eventdata[2])