diff --git a/wavinfo/umid_parser.py b/wavinfo/umid_parser.py
index b278820..150a14b 100644
--- a/wavinfo/umid_parser.py
+++ b/wavinfo/umid_parser.py
@@ -7,7 +7,7 @@ class UMIDParser:
 
     This implementation is based on SMPTE ST 330:2011
     """
-    def __init__(self, raw_umid : bytearray):
+    def __init__(self, raw_umid: bytearray):
         self.raw_umid = raw_umid
 
     @property