diff --git a/django/db/backends/postgresql/encodings.py b/django/db/backends/postgresql/encodings.py
index ad9bf1807d..934cc6e6de 100644
--- a/django/db/backends/postgresql/encodings.py
+++ b/django/db/backends/postgresql/encodings.py
@@ -2,6 +2,7 @@
 # doesn't exist in psycopg, so we have to maintain it by hand (using
 # information from section 21.2.1 in the PostgreSQL manual).
 ENCODING_MAP = {
+    "ALT": 'cp866',
     "BIG5": 'big5-tw',
     "EUC_CN": 'gb2312',
     "EUC_JP": 'euc_jp',
@@ -26,8 +27,11 @@ ENCODING_MAP = {
     "LATIN9": 'iso8859_15',
     "SJIS": 'shift_jis',
     "SQL_ASCII": 'ascii',
+    "TCVN": 'cp1258',
     "UHC": 'cp949',
+    "UNICODE": 'utf-8',
     "UTF8": 'utf-8',
+    "WIN": 'cp1251',
     "WIN866": 'cp866',
     "WIN874": 'cp874',
     "WIN1250": 'cp1250',
@@ -39,46 +43,6 @@ ENCODING_MAP = {
     # Unsupported (no equivalents in codecs module):
     # EUC_TW
     # LATIN10
+    # MULE_INTERNAL
 }
-# Mapping between PostgreSQL encodings and Python codec names. This mapping
-# doesn't exist in psycopg, so we have to maintain it by hand (using
-# information from section 21.2.1 in the PostgreSQL manual).
-ENCODING_MAP = {
-    "BIG5": 'big5-tw',
-    "EUC_CN": 'gb2312',
-    "EUC_JP": 'euc_jp',
-    "EUC_KR": 'euc_kr',
-    "GB18030": 'gb18030',
-    "GBK": 'gbk',
-    "ISO_8859_5": 'iso8859_5',
-    "ISO_8859_6": 'iso8859_6',
-    "ISO_8859_7": 'iso8859_7',
-    "ISO_8859_8": 'iso8859_8',
-    "JOHAB": 'johab',
-    "KOI8": 'koi18_r',
-    "KOI18R": 'koi18_r',
-    "LATIN1": 'latin_1',
-    "LATIN2": 'iso8859_2',
-    "LATIN3": 'iso8859_3',
-    "LATIN4": 'iso8859_4',
-    "LATIN5": 'iso8859_9',
-    "LATIN6": 'iso8859_10',
-    "LATIN7": 'iso8859_13',
-    "LATIN8": 'iso8859_14',
-    "LATIN9": 'iso8859_15',
-    "SJIS": 'shift_jis',
-    "SQL_ASCII": 'ascii',
-    "UHC": 'cp949',
-    "UTF8": 'utf-8',
-    "WIN866": 'cp866',
-    "WIN874": 'cp874',
-    "WIN1250": 'cp1250',
-    "WIN1251": 'cp1251',
-    "WIN1252": 'cp1252',
-    "WIN1256": 'cp1256',
-    "WIN1258": 'cp1258',
 
-    # Unsupported (no equivalents in codecs module):
-    # EUC_TW
-    # LATIN10
-}