diff --git a/Tools/scripts/gencodec.py b/Tools/scripts/gencodec.py
index bc70a32..69b6ede 100644
--- a/Tools/scripts/gencodec.py
+++ b/Tools/scripts/gencodec.py
@@ -244,9 +244,7 @@
     append('''
 ### Encoding Map
 
-encoding_map = {}
-for k,v in decoding_map.items():
-    encoding_map[v] = k
+encoding_map = codecs.make_encoding_map(decoding_map)
 ''')
     return string.join(l,'\n')