diff --git a/certbot-nginx/certbot_nginx/_internal/configurator.py b/certbot-nginx/certbot_nginx/_internal/configurator.py
index 70d9d87f8..fdead036a 100644
--- a/certbot-nginx/certbot_nginx/_internal/configurator.py
+++ b/certbot-nginx/certbot_nginx/_internal/configurator.py
@@ -1008,7 +1008,7 @@ class NginxConfigurator(common.Installer):
             matches = re.findall(r"built with OpenSSL ([^ ]+) ", text)
             if not matches:
                 logger.warning("NGINX configured with OpenSSL alternatives is not officially"
-                    "supported by Certbot.")
+                    " supported by Certbot.")
                 return ""
         return matches[0]