diff --git a/build/package.json b/build/package.json
index 141f64652..9c72e4a0c 100644
--- a/build/package.json
+++ b/build/package.json
@@ -2,6 +2,7 @@
   "name": "atom-build-scripts",
   "description": "Atom build scripts",
   "dependencies": {
+    "async": "^2.0.1",
     "babel-core": "5.8.38",
     "coffee-script": "1.8.0",
     "colors": "1.1.2",
diff --git a/build/test.js b/build/test.js
index 046d0bb05..e1277b827 100755
--- a/build/test.js
+++ b/build/test.js
@@ -2,6 +2,7 @@
 
 'use strict'
 
+const async = require('async')
 require('colors')
 
 const path = require('path')
@@ -18,6 +19,19 @@ const testArguments = [
   '--test', testPath
 ]
 
-console.log('Executing core specs...'.bold.green)
-const exitStatus = childProcess.spawnSync(executablePath, testArguments, {stdio: 'inherit'}).status
-process.exit(exitStatus)
+function runCoreSpecs (callback) {
+  console.log('Executing core specs...'.bold.green)
+  const cp = childProcess.spawn(executablePath, testArguments, {stdio: 'inherit'})
+  cp.on('error', error => { callback(error) })
+  cp.on('close', exitCode => { callback(null, exitCode) })
+}
+
+async.parallelLimit([runCoreSpecs], 2, function (err, exitCodes) {
+  if (err) {
+    console.error(err)
+    process.exit(1)
+  } else {
+    const testsPassed = exitCodes.every(exitCode => exitCode === 0)
+    process.exit(testsPassed ? 0 : 1)
+  }
+})