diff --git a/nixos/modules/services/web-servers/nginx/default.nix b/nixos/modules/services/web-servers/nginx/default.nix
index 166e5a6b2ce..698d37133d7 100644
--- a/nixos/modules/services/web-servers/nginx/default.nix
+++ b/nixos/modules/services/web-servers/nginx/default.nix
@@ -138,7 +138,7 @@ let
             server_name ${serverName} ${concatStringsSep " " vhost.serverAliases};
             ${acmeLocation}
             location / {
-              return 301 https://$host${optionalString (port != 443) ":${port}"}$request_uri;
+              return 301 https://$host${optionalString (port != 443) ":${toString port}"}$request_uri;
             }
           }
         ''}