diff --git a/flake.nix b/flake.nix
index 594a04385..f37f57ff8 100644
--- a/flake.nix
+++ b/flake.nix
@@ -112,7 +112,7 @@
               cd ../
             '';
           };
-        manifold-emscripten = { parallel }: pkgs.buildEmscriptenPackage {
+        manifold-emscripten = { parallel, doCheck ? true }: pkgs.buildEmscriptenPackage {
           name = "manifold-js";
           version = manifold-version;
           src = self;
@@ -134,11 +134,11 @@
           buildPhase = ''
             emmake make -j''${NIX_BUILD_CORES}
           '';
-          checkPhase = ''
+          checkPhase = if doCheck then ''
             cd test
             node manifold_test.js
             cd ../
-          '';
+          '' else "";
           installPhase = ''
             mkdir -p $out
             cp bindings/wasm/manifold.* $out/
@@ -150,7 +150,11 @@
           manifold-tbb = manifold { };
           manifold-none = manifold { parallel = false; };
           manifold-js = manifold-emscripten { parallel = false; };
-          manifold-js-tbb = manifold-emscripten { parallel = true; };
+          # disable check for now
+          manifold-js-tbb = manifold-emscripten {
+            parallel = true;
+            doCheck = false;
+          };
           # but how should we make it work with other python versions?
           manifold3d = with pkgs.python3Packages; buildPythonPackage {
             pname = "manifold3d";