| Index: presubmit_support.py | 
| diff --git a/presubmit_support.py b/presubmit_support.py | 
| index 23cc5e427ab9cfe101e5cdc0ad65da14e0312807..9baee8c5c0b90d51ada1fa560dc338b90b44a802 100755 | 
| --- a/presubmit_support.py | 
| +++ b/presubmit_support.py | 
| @@ -478,7 +478,7 @@ class InputApi(object): | 
| else: | 
| assert issubclass(t.message, _PresubmitResult) | 
| tests.append(t) | 
| -    if tests and parallel: | 
| +    if len(tests) > 1 and parallel: | 
| pool = multiprocessing.Pool() | 
| # async recipe works around multiprocessing bug handling Ctrl-C | 
| msgs.extend(pool.map_async(CallCommand, tests).get(99999)) | 
|  |