diff --git a/trytond/trytond/backend/postgresql/database.py b/trytond/trytond/backend/postgresql/database.py
index ab4d7169a2..7c7420ac62 100644
--- a/trytond/trytond/backend/postgresql/database.py
+++ b/trytond/trytond/backend/postgresql/database.py
@@ -264,7 +264,7 @@ class Database(DatabaseInterface):
         for count in range(retry, -1, -1):
             try:
                 conn = self._connpool.getconn()
-            except PoolError:
+            except (PoolError, DatabaseOperationalError):
                 if count and not self._connpool.closed:
                     logger.info('waiting a connection')
                     time.sleep(1)