diff --git a/runbot/runbot.py b/runbot/runbot.py
index 1df60fdc..17d491dd 100644
--- a/runbot/runbot.py
+++ b/runbot/runbot.py
@@ -697,7 +697,7 @@ class runbot_build(osv.osv):
                 cmd.append("--no-netrpc")
             if grep(build.server("tools/config.py"), "log-db"):
                 logdb = cr.dbname
-                if grep(build.server('sql_db.py'), 'allow_uri'):
+                if config['db_host'] and grep(build.server('sql_db.py'), 'allow_uri'):
                     logdb = 'postgres://{cfg[db_user]}:{cfg[db_password]}@{cfg[db_host]}/{db}'.format(cfg=config, db=cr.dbname)
                 cmd += ["--log-db=%s" % logdb]