diff --git a/openerp/models.py b/openerp/models.py
index 9c3febfdaa7..e7e803f2608 100644
--- a/openerp/models.py
+++ b/openerp/models.py
@@ -2505,7 +2505,7 @@ class BaseModel(object):
                                 ('numeric', 'float', get_pg_type(f)[1], '::'+get_pg_type(f)[1]),
                                 ('float8', 'float', get_pg_type(f)[1], '::'+get_pg_type(f)[1]),
                             ]
-                            if f_pg_type == 'varchar' and f._type == 'char' and f_pg_size and (f.size is None or f_pg_size < f.size):
+                            if f_pg_type == 'varchar' and f._type in ('char', 'selection') and f_pg_size and (f.size is None or f_pg_size < f.size):
                                 try:
                                     with cr.savepoint():
                                         cr.execute('ALTER TABLE "%s" ALTER COLUMN "%s" TYPE %s' % (self._table, k, pg_varchar(f.size)))