diff --git a/pyghmi/ipmi/private/util.py b/pyghmi/ipmi/private/util.py
index daec6647..660f56dd 100644
--- a/pyghmi/ipmi/private/util.py
+++ b/pyghmi/ipmi/private/util.py
@@ -28,7 +28,7 @@ def decode_wireformat_uuid(rawguid):
         rawguid = bytearray(rawguid)
     lebytes = struct.unpack_from('<IHH', buffer(rawguid[:8]))
     bebytes = struct.unpack_from('>HHI', buffer(rawguid[8:]))
-    return '{0:04X}-{1:02X}-{2:02X}-{3:02X}-{4:02X}{5:04X}'.format(
+    return '{0:08X}-{1:04X}-{2:04X}-{3:04X}-{4:04X}{5:08X}'.format(
         lebytes[0], lebytes[1], lebytes[2], bebytes[0], bebytes[1], bebytes[2])