diff --git a/odoo/modules/registry.py b/odoo/modules/registry.py
index e537e3f8a18..cf79f47a692 100644
--- a/odoo/modules/registry.py
+++ b/odoo/modules/registry.py
@@ -506,15 +506,16 @@ class Registry(Mapping):
         for key, val in self._foreign_keys.items():
             table1, column1 = key
             table2, column2, ondelete, model, module = val
-            conname = '%s_%s_fkey' % key
             deltype = sql._CONFDELTYPES[ondelete.upper()]
             spec = existing.get(key)
             if spec is None:
                 sql.add_foreign_key(cr, table1, column1, table2, column2, ondelete)
+                conname = sql.get_foreign_keys(cr, table1, column1, table2, column2, ondelete)[0]
                 model.env['ir.model.constraint']._reflect_constraint(model, conname, 'f', None, module)
             elif (spec[1], spec[2], spec[3]) != (table2, column2, deltype):
                 sql.drop_constraint(cr, table1, spec[0])
                 sql.add_foreign_key(cr, table1, column1, table2, column2, ondelete)
+                conname = sql.get_foreign_keys(cr, table1, column1, table2, column2, ondelete)[0]
                 model.env['ir.model.constraint']._reflect_constraint(model, conname, 'f', None, module)
 
     def check_tables_exist(self, cr):
diff --git a/odoo/tools/sql.py b/odoo/tools/sql.py
index 7445396856b..2bc82358416 100644
--- a/odoo/tools/sql.py
+++ b/odoo/tools/sql.py
@@ -172,6 +172,25 @@ def add_foreign_key(cr, tablename1, columnname1, tablename2, columnname2, ondele
                   tablename1, columnname1, tablename2, columnname2, ondelete)
     return True
 
+def get_foreign_keys(cr, tablename1, columnname1, tablename2, columnname2, ondelete):
+    cr.execute(
+        """
+            SELECT fk.conname as name
+            FROM pg_constraint AS fk
+            JOIN pg_class AS c1 ON fk.conrelid = c1.oid
+            JOIN pg_class AS c2 ON fk.confrelid = c2.oid
+            JOIN pg_attribute AS a1 ON a1.attrelid = c1.oid AND fk.conkey[1] = a1.attnum
+            JOIN pg_attribute AS a2 ON a2.attrelid = c2.oid AND fk.confkey[1] = a2.attnum
+            WHERE fk.contype = 'f'
+            AND c1.relname = %s
+            AND a1.attname = %s
+            AND c2.relname = %s
+            AND a2.attname = %s
+            AND fk.confdeltype = %s
+        """, [tablename1, columnname1, tablename2, columnname2, _CONFDELTYPES[ondelete.upper()]]
+    )
+    return [r[0] for r in cr.fetchall()]
+
 def fix_foreign_key(cr, tablename1, columnname1, tablename2, columnname2, ondelete):
     """ Update the foreign keys between tables to match the given one, and
         return ``True`` if the given foreign key has been recreated.