diff --git a/package.json b/package.json
index 7630c28..70488d9 100644
--- a/package.json
+++ b/package.json
@@ -45,7 +45,7 @@
     "lint-fix": "eslint --fix --ignore-path .eslintignore --ext .js,.ts . --max-warnings=0",
     "format-staged": "pretty-quick --staged",
     "format": "pretty-quick",
-    "build": "npm run tests && npm run clean && tsc --project tsconfig.cjs.json & tsc --project tsconfig.esm.json",
+    "build": "npm run tests && npm run clean && tsc --project tsconfig.cjs.json && tsc --project tsconfig.esm.json",
     "test:unit": "mocha -r ts-node/register",
     "test:integration": "mocha -r ts-node/register -r integrationTests/mochaRootHooks.ts",
     "tests:unit": "mocha -R progress -r ts-node/register ./tests/**/*.spec.ts",