diff --git a/Utilities/build-script-helper.py b/Utilities/build-script-helper.py
index ef85c19b..1a2c962e 100755
--- a/Utilities/build-script-helper.py
+++ b/Utilities/build-script-helper.py
@@ -86,7 +86,7 @@ def add_common_args(parser):
     tests = os.path.join(bin_path, 'isdb-tests')
     print('Cleaning ' + tests)
     shutil.rmtree(tests, ignore_errors=True)
-    swiftpm('test', swift_exec, swiftpm_args, env)
+    swiftpm('test', swift_exec, swiftpm_args + ['--parallel'], env)
   else:
     assert False, 'unknown action \'{}\''.format(args.action)