--- a/Lib/site.py
+++ b/Lib/site.py
@@ -76,7 +76,7 @@ import _sitebuiltins
 import io
 
 # Prefixes for site-packages; add additional prefixes like /usr/local here
-PREFIXES = [sys.prefix, sys.exec_prefix]
+PREFIXES = [sys.prefix, sys.exec_prefix, '/usr/local']
 # Enable per user site-packages directory
 # set it to False to disable the feature or True to force the feature
 ENABLE_USER_SITE = None