diff --git a/tests/tools/lib/replay_schema.json b/tests/tools/lib/replay_schema.json
index 567a755578e..8b0baea29ff 100644
--- a/tests/tools/lib/replay_schema.json
+++ b/tests/tools/lib/replay_schema.json
@@ -166,7 +166,7 @@
           "items": {
             "description": "HTTP field.",
             "type": "array",
-            "items": [
+            "prefixItems": [
               {
                 "description": "Name of the field.",
                 "type": "string"