diff --git a/nixos/modules/services/web-servers/nginx/default.nix b/nixos/modules/services/web-servers/nginx/default.nix
index a7efd69adac3..d9081ec65275 100644
--- a/nixos/modules/services/web-servers/nginx/default.nix
+++ b/nixos/modules/services/web-servers/nginx/default.nix
@@ -896,7 +896,7 @@ in
       typesHashMaxSize = mkOption {
         type = types.ints.positive;
         default = if cfg.defaultMimeTypes == "${pkgs.mailcap}/etc/nginx/mime.types" then 2688 else 1024;
-        defaultText = literalExpression ''if cfg.defaultMimeTypes == "''${pkgs.mailcap}/etc/nginx/mime.types" then 2688 else 1024'';
+        defaultText = literalExpression ''if config.services.nginx.defaultMimeTypes == "''${pkgs.mailcap}/etc/nginx/mime.types" then 2688 else 1024'';
         description = ''
           Sets the maximum size of the types hash tables (`types_hash_max_size`).
           It is recommended that the minimum size possible size is used.