diff --git a/systemd/ndncert-ca.service.in b/systemd/ndncert-ca.service.in
index 5ac1a2b..94ac006 100644
--- a/systemd/ndncert-ca.service.in
+++ b/systemd/ndncert-ca.service.in
@@ -6,6 +6,7 @@
 ExecStart=@BINDIR@/ndncert-ca-server
 Restart=on-failure
 RestartPreventExitStatus=2
+RestartSec=5
 User=ndn
 
 [Install]