diff --git a/query_classifier/test/maxscale.test b/query_classifier/test/maxscale.test
index c359b471a..1eb3d3b45 100644
--- a/query_classifier/test/maxscale.test
+++ b/query_classifier/test/maxscale.test
@@ -163,3 +163,6 @@ OPTIMIZE LOCAL TABLE t WAIT 42;
 
 # MXS-3292
 USE `test`;
+
+# MXS-3404
+SELECT rdba_test() AS crmid, trim(LEADING 0 FROM @@server_id);