diff --git a/Lib/encodings/cp865.py b/Lib/encodings/cp865.py
index 4d9010d..cc4f719 100644
--- a/Lib/encodings/cp865.py
+++ b/Lib/encodings/cp865.py
@@ -169,6 +169,4 @@
 
 ### Encoding Map
 
-encoding_map = {}
-for k,v in decoding_map.items():
-    encoding_map[v] = k
+encoding_map = codecs.make_encoding_map(decoding_map)