diff --git a/karma.conf.cjs b/karma.conf.cjs
index 2df3336..9510986 100644
--- a/karma.conf.cjs
+++ b/karma.conf.cjs
@@ -7,7 +7,7 @@ module.exports = function (config) {
     frameworks: [
       "webpack",
       "mocha",
-      //"chai",
+      "chai",
     ],
     files: [
       "test/unit-web/run-web-implementation.test.ts",
diff --git a/test/unit-web/run-web-implementation.test.ts b/test/unit-web/run-web-implementation.test.ts
index 343bcd6..1ef09f8 100644
--- a/test/unit-web/run-web-implementation.test.ts
+++ b/test/unit-web/run-web-implementation.test.ts
@@ -1,4 +1,3 @@
-import herumi from "../../src/herumi/index.js";
 import {runSecretKeyTests} from "../unit/secretKey.test.js";
 import {runPublicKeyTests} from "../unit/publicKey.test.js";
 import {runIndexTests} from "../unit/index.test.js";
@@ -6,7 +5,8 @@ import {runIndexTests} from "../unit/index.test.js";
 // This file is intended to be compiled and run by Karma
 // Do not import the node.bindings or it will break with:
 // Error: BLST bindings loader should only run in a NodeJS context: process.platform
-describe("herumi", () => {
+describe("herumi", async () => {
+  const herumi = (await import("../../src/herumi/index.js")).default;
   runSecretKeyTests(herumi);
   runPublicKeyTests(herumi);
   runIndexTests(herumi);
diff --git a/test/unit/index-named-exports.test.ts b/test/unit/index-named-exports.test.ts
index de54de6..2d14dca 100644
--- a/test/unit/index-named-exports.test.ts
+++ b/test/unit/index-named-exports.test.ts
@@ -1,8 +1,13 @@
 import {expect} from "chai";
-import bls from "../../src/index.js";
-import type {SecretKey, PublicKey, Signature} from "../../src/types.js";
+import type {SecretKey, PublicKey, Signature, IBls} from "../../src/types.js";
+
+describe("types named exports", async () => {
+  let bls: IBls;
+
+  before(async () => {
+    bls = (await import("../../src/index.js")).default;
+  });
 
-describe("types named exports", () => {
   it("Classes and methods should be defined", async () => {
     /**
      * Sample helper to test argument typing