diff --git a/src/test_data.py b/src/test_data.py
index aa6a01e5..db5c2be8 100644
--- a/src/test_data.py
+++ b/src/test_data.py
@@ -395,4 +395,5 @@ METRICS_WITH_INITIAL_VALUE_ZERO = [
     'waku_filter_handle_message_duration_seconds_bucket{le="15.0"}',
     'waku_filter_handle_message_duration_seconds_bucket{le="20.0"}',
     'waku_filter_handle_message_duration_seconds_bucket{le="30.0"}',
+    "total_messages_cached",
 ]