diff --git a/.circleci/config.yml b/.circleci/config.yml
index 1294557..342842d 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -63,6 +63,13 @@ jobs:
       - checkout
       - setup_npm
       - run: npm run lint
+      - run:
+          # NOTE: Karma loads ts-node automatically and treats karma.conf.js as a TypeScript.
+          # Karma does not starts by karma.conf.js transpile failure, and this hack removes
+          # ts-node module from the local before test.
+          # See: https://github.com/karma-runner/karma/issues/3329
+          name: Remove node-ts from node_modules
+          command: mv node_modules/ts-node node_modules/ts-node.orig
       - run: npm test
       - run: npm run package
 
diff --git a/package.json b/package.json
index 4496ce5..45e5b88 100644
--- a/package.json
+++ b/package.json
@@ -8,7 +8,7 @@
     "lint": "eslint --ext .js,.jsx,.ts,.tsx src",
     "type-checks": "tsc --noEmit",
     "test": "karma start",
-    "test:e2e": "mocha --timeout 10000 --retries 5 e2e"
+    "test:e2e": "mocha --timeout 10000 --retries 5 --require ts-node/register --extension ts e2e"
   },
   "repository": {
     "type": "git",