diff --git a/wo/cli/plugins/site_functions.py b/wo/cli/plugins/site_functions.py
index 8d05d5d..dc9900d 100644
--- a/wo/cli/plugins/site_functions.py
+++ b/wo/cli/plugins/site_functions.py
@@ -1368,7 +1368,7 @@ def setupLetsEncrypt(self, wo_domain_name, subdomain=False, wildcard=False,
                                        "--config-home "
                                        "'/etc/letsencrypt/config' "
                                        "--issue "
-                                       "-d {0} {1}"
+                                       "-d {0} {1} "
                                        "-k {2} -f"
                                        .format(wo_domain_name,
                                                acme_mode,