diff --git a/package.json b/package.json
index fe25eec..f33fa20 100644
--- a/package.json
+++ b/package.json
@@ -8,7 +8,7 @@
     "build": "tsc -d",
     "prepublishOnly": "npm run build && npm run test",
     "format": "prettier --write '{src,test}/**/*'",
-    "test": "TS_NODE_COMPILER_OPTIONS='{\"module\":\"commonjs\"}' mocha --require ts-node/register test/**/*"
+    "test": "mocha --require ts-node/register test/**/*"
   },
   "repository": {
     "type": "git",
diff --git a/tsconfig.json b/tsconfig.json
index 4406ff3..240f8e7 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -1,7 +1,7 @@
 {
   "compileOnSave": false,
   "compilerOptions": {
-    "module": "ES6",
+    "module": "commonjs",
     "moduleResolution": "node",
     "target": "ES5",
     "sourceMap": true,