diff --git a/filebeat/tests/system/test_json.py b/filebeat/tests/system/test_json.py
index 7c2b38f7df5..e4803a765df 100644
--- a/filebeat/tests/system/test_json.py
+++ b/filebeat/tests/system/test_json.py
@@ -157,6 +157,7 @@ def test_config_no_msg_key_multiline(self):
             json=dict(
                 keys_under_root=True),
             multiline=True,
+            match="after",
             pattern="^\\["
         )