diff --git a/modules/services/networking/openvpn.nix b/modules/services/networking/openvpn.nix
index 63b6cc90f07..1e862591406 100644
--- a/modules/services/networking/openvpn.nix
+++ b/modules/services/networking/openvpn.nix
@@ -49,7 +49,7 @@ let
     in {
       description = "OpenVPN instance ‘${name}’";
 
-      wantedBy = optional cfg.autoStart [ "multi-user.target" ];
+      wantedBy = optional cfg.autoStart "multi-user.target";
       after = [ "network-interfaces.target" ];
 
       path = [ pkgs.iptables pkgs.iproute pkgs.nettools ];