diff --git a/testing/web-platform/harness/wptrunner/wptcommandline.py b/testing/web-platform/harness/wptrunner/wptcommandline.py
index 01576ea5a20b..e402f1b7c8ad 100644
--- a/testing/web-platform/harness/wptrunner/wptcommandline.py
+++ b/testing/web-platform/harness/wptrunner/wptcommandline.py
@@ -297,7 +297,7 @@ def check_args(kwargs):
 
     if kwargs["chunk_type"] is None:
         if kwargs["total_chunks"] > 1:
-            kwargs["chunk_type"] = "equal_time"
+            kwargs["chunk_type"] = "dir_hash"
         else:
             kwargs["chunk_type"] = "none"