diff --git a/Lib/multiprocessing/__init__.py b/Lib/multiprocessing/__init__.py
index f965056..10be01a 100644
--- a/Lib/multiprocessing/__init__.py
+++ b/Lib/multiprocessing/__init__.py
@@ -113,7 +113,7 @@
             num = int(os.environ['NUMBER_OF_PROCESSORS'])
         except (ValueError, KeyError):
             num = 0
-    elif sys.platform == 'darwin':
+    elif 'bsd' in sys.platform or sys.platform == 'darwin':
         try:
             num = int(os.popen('sysctl -n hw.ncpu').read())
         except ValueError: