diff --git a/nix/modules/default/default.nix b/nix/modules/default/default.nix
index 73acadc47..dcc1db764 100644
--- a/nix/modules/default/default.nix
+++ b/nix/modules/default/default.nix
@@ -88,6 +88,7 @@ in
             attrsOf (oneOf [
               str
               bool
+              int
             ]);
           options = {
             THREADS = lib.mkOption {