diff --git a/nixos/modules/services/web-servers/caddy/default.nix b/nixos/modules/services/web-servers/caddy/default.nix
index dcacb40e4681..cc89553fbb75 100644
--- a/nixos/modules/services/web-servers/caddy/default.nix
+++ b/nixos/modules/services/web-servers/caddy/default.nix
@@ -378,7 +378,7 @@ in
         LogsDirectory = mkIf (cfg.logDir == "/var/log/caddy") [ "caddy" ];
         Restart = "on-failure";
         RestartPreventExitStatus = 1;
-        RestartSecs = "5s";
+        RestartSec = "5s";
 
         # TODO: attempt to upstream these options
         NoNewPrivileges = true;