diff --git a/odoo/sql_db.py b/odoo/sql_db.py
index 749abc69932..3a97bc47632 100644
--- a/odoo/sql_db.py
+++ b/odoo/sql_db.py
@@ -48,6 +48,7 @@ psycopg2.extensions.register_type(psycopg2.extensions.new_type((700, 701, 1700,)
 
 from . import tools
 from .tools.func import frame_codeinfo
+from .tools import pycompat
 
 from .tools import parse_version as pv
 if pv(psycopg2.__version__) < pv('2.7'):
@@ -58,8 +59,8 @@ if pv(psycopg2.__version__) < pv('2.7'):
             raise ValueError("A string literal cannot contain NUL (0x00) characters.")
         return QuotedString(adapted)
 
-    psycopg2.extensions.register_adapter(str, adapt_string)
-    psycopg2.extensions.register_adapter(unicode, adapt_string)
+    for type_ in pycompat.string_types:
+        psycopg2.extensions.register_adapter(type_, adapt_string)
 
 from datetime import timedelta
 import threading