diff --git a/Lib/test/support.py b/Lib/test/support.py
index 51375d5..01cd203 100644
--- a/Lib/test/support.py
+++ b/Lib/test/support.py
@@ -1460,6 +1460,7 @@
     flag_opt_map = {
         'bytes_warning': 'b',
         'dont_write_bytecode': 'B',
+        'hash_randomization': 'R',
         'ignore_environment': 'E',
         'no_user_site': 's',
         'no_site': 'S',