diff --git a/mypy_self_check.ini b/mypy_self_check.ini
index cec47fb85b11..7780edb0cf0c 100644
--- a/mypy_self_check.ini
+++ b/mypy_self_check.ini
@@ -23,3 +23,4 @@ show_traceback = True
 
 # Miscellaneous
 sqlite_cache = True
+num_workers = 4