       continue unless isAtomPackage(packagePath)
       packageSpecQueue.push(packagePath)
 
-    packageSpecQueue.concurrency = 1
+    packageSpecQueue.concurrency = concurrency - 1
     packageSpecQueue.drain = -> callback(null, failedPackages)
 
   runCoreSpecs = (callback) ->

    method [runCoreSpecs, runPackageSpecs], (error, results) ->
      [coreSpecFailed, failedPackages] = results
      elapsedTime = Math.round((Date.now() - startTime) / 100) / 10
      grunt.log.ok("Total spec time: #{elapsedTime}s")
      failures = failedPackages
      failures.push "atom core" if coreSpecFailed


        fs.unlinkSync('ci.log')
      else
        # TODO: Restore concurrency on Windows
        packageSpecQueue.concurrency = concurrency

      callback(null, error)

