diff --git a/package.json b/package.json
index f666be4..8050ee0 100644
--- a/package.json
+++ b/package.json
@@ -25,7 +25,7 @@
     "prettify": "prettier --write \"src/**/*.ts\" \"test/**/*.ts\"",
     "format": "pnpm lint && pnpm prettify",
     "lint": "eslint ./src ./test --ext .ts --fix",
-    "test": "NODE_ENV=test mocha",
+    "test": "env TS_NODE_COMPILER_OPTIONS='{\"module\": \"commonjs\" }' NODE_ENV=test mocha",
     "coverage": "nyc npm test",
     "coverage:codecov": "nyc --reporter=lcov npm test && codecov"
   },
diff --git a/test/src/index.spec.ts b/test/src/index.spec.ts
index 4d62b7e..c8500e9 100644
--- a/test/src/index.spec.ts
+++ b/test/src/index.spec.ts
@@ -1,7 +1,7 @@
 import * as _ from 'lodash'
 import should from 'should'
 
-import * as o2diff from '../../src'
+import * as o2diff from '../../src/index'
 import { getObjectID } from './test-utils'
 
 describe('o2diff / main', () => {