diff --git a/src/pl/plpython/plpy_util.c b/src/pl/plpython/plpy_util.c
new file mode 100644
index 9a4901e..5fafbd1
*** a/src/pl/plpython/plpy_util.c
--- b/src/pl/plpython/plpy_util.c
*************** PLyUnicode_Bytes(PyObject *unicode)
*** 66,80 ****
  
  	/*
  	 * Python understands almost all PostgreSQL encoding names, but it doesn't
! 	 * know SQL_ASCII.
  	 */
! 	if (GetDatabaseEncoding() == PG_SQL_ASCII)
! 		serverenc = "ascii";
! 	else
! 		serverenc = GetDatabaseEncodingName();
  	rv = PyUnicode_AsEncodedString(unicode, serverenc, "strict");
! 	if (rv == NULL)
! 		PLy_elog(ERROR, "could not convert Python Unicode object to PostgreSQL server encoding");
  	return rv;
  }
  
--- 66,125 ----
  
  	/*
  	 * Python understands almost all PostgreSQL encoding names, but it doesn't
! 	 * know SQL_ASCII and calls the Windows encodings differently.
  	 */
! 	switch (GetDatabaseEncoding())
! 	{
! 		case PG_SQL_ASCII:
! 			serverenc = "ascii";
! 			break;
! 		case PG_WIN1250:
! 			serverenc = "cp1250";
! 			break;
! 		case PG_WIN1251:
! 			serverenc = "cp1251";
! 			break;
! 		case PG_WIN1252:
! 			serverenc = "cp1252";
! 			break;
! 		case PG_WIN1253:
! 			serverenc = "cp1253";
! 			break;
! 		case PG_WIN1254:
! 			serverenc = "cp1254";
! 			break;
! 		case PG_WIN1255:
! 			serverenc = "cp1255";
! 			break;
! 		case PG_WIN1256:
! 			serverenc = "cp1256";
! 			break;
! 		case PG_WIN1257:
! 			serverenc = "cp1257";
! 			break;
! 		case PG_WIN1258:
! 			serverenc = "cp1258";
! 			break;
! 		case PG_WIN866:
! 			serverenc = "cp866";
! 			break;
! 		case PG_WIN874:
! 			serverenc = "cp874";
! 			break;
! 		default:
! 			serverenc = GetDatabaseEncodingName();
! 			break;
! 	}
! 
  	rv = PyUnicode_AsEncodedString(unicode, serverenc, "strict");
! 	if (rv == NULL) {
! 		/*
! 		 * Use a plan elog instead of PLy_elog here to avoid getting in
! 		 * recursion trouble when the traceback formatting functions try doing
! 		 * unicode to bytes conversion.
! 		 */
! 		elog(ERROR, "could not convert Python Unicode object to PostgreSQL server encoding");
! 	}
  	return rv;
  }