diff --git a/psutil/tests/test_process_all.py b/psutil/tests/test_process_all.py
index cf7f11206..ee1a9b58d 100755
--- a/psutil/tests/test_process_all.py
+++ b/psutil/tests/test_process_all.py
@@ -41,7 +41,9 @@
 from psutil.tests import serialrun
 
 
-USE_PROC_POOL = not CI_TESTING
+# Cuts the time in half, but (e.g.) on macOS the process pool stays
+# alive after join() (multiprocessing bug?), messing up other tests.
+USE_PROC_POOL = LINUX and not CI_TESTING
 
 
 def proc_info(pid):