diff --git a/dpdispatcher/contexts/ssh_context.py b/dpdispatcher/contexts/ssh_context.py
index 3cab51d5..179e02fa 100644
--- a/dpdispatcher/contexts/ssh_context.py
+++ b/dpdispatcher/contexts/ssh_context.py
@@ -72,7 +72,7 @@ def __init__(
     #     count = 1
     #     while not self._check_alive():
     #         if count == max_check:
-    #             raise RuntimeError('cannot connect ssh after %s failures at interval %s s' %
+    #             raise RuntimeError('cannot connect ssh after %d failures at interval %d s' %
     #                                (max_check, sleep_time))
     #         dlog.info('connection check failed, try to reconnect to ' + self.remote_host)
     #         self._setup_ssh(hostname=self.remote_host,