diff --git a/nixos/modules/issuer.nix b/nixos/modules/issuer.nix
index d3a48ecb4c912f45bdc64bc9f891bd1c6f1dab6e..c9424785ba94d9c6c16f5e5e636706240b316b2d 100644
--- a/nixos/modules/issuer.nix
+++ b/nixos/modules/issuer.nix
@@ -263,7 +263,7 @@ in {
           #
           # http://nginx.org/en/docs/http/ngx_http_proxy_module.html#proxy_read_timeout
           extraConfig = ''
-            proxy_read_timeout = 660;
+            proxy_read_timeout 660;
           '';
         };
         locations."/metrics" = {