diff --git a/maxscale-system-test/cnf/maxscale.cnf.template.mysqlmon_multimaster b/maxscale-system-test/cnf/maxscale.cnf.template.mysqlmon_multimaster
index 749147a54..3d2b64508 100644
--- a/maxscale-system-test/cnf/maxscale.cnf.template.mysqlmon_multimaster
+++ b/maxscale-system-test/cnf/maxscale.cnf.template.mysqlmon_multimaster
@@ -18,6 +18,7 @@ servers=server1, server2, server3, server4
 user=maxskysql
 password=skysql
 slave_selection_criteria=LEAST_ROUTER_CONNECTIONS
+max_slave_replication_lag=1
 
 [Read Connection Router Slave]
 type=service
diff --git a/maxscale-system-test/mysqlmon_multimaster.cpp b/maxscale-system-test/mysqlmon_multimaster.cpp
index 34ce5a6d2..6022f5a55 100644
--- a/maxscale-system-test/mysqlmon_multimaster.cpp
+++ b/maxscale-system-test/mysqlmon_multimaster.cpp
@@ -201,8 +201,6 @@ int main(int argc, char* argv[])
     test.maxscales->wait_for_monitor(2);
     auto maxconn = test.maxscales->open_rwsplit_connection();
     test.try_query(maxconn, "FLUSH TABLES;");
-    mysql_close(maxconn);
-
     test.maxscales->wait_for_monitor(1);
 
     check_status(test, "server1", mm_master_states);
@@ -214,6 +212,10 @@ int main(int argc, char* argv[])
     check_group(test, "server3", 1);
     check_group(test, "server4", 0);
     check_rlag(test, "server4", 1, max_rlag);
+    // Need to send a read query so that rwsplit detects replication lag.
+    test.try_query(maxconn, "SHOW DATABASES;");
+    mysql_close(maxconn);
+    test.log_includes(0, "is excluded from query routing.");
 
     test.tprintf("Test 2 - Set nodes 0 and 1 into read-only mode");
 
@@ -328,7 +330,6 @@ int main(int argc, char* argv[])
     test.maxscales->wait_for_monitor(1);
     maxconn = test.maxscales->open_rwsplit_connection();
     test.try_query(maxconn, "FLUSH TABLES;");
-    mysql_close(maxconn);
     test.maxscales->wait_for_monitor(1);
 
     check_status(test, "server1", slave_states);
@@ -349,6 +350,10 @@ int main(int argc, char* argv[])
 
     check_status(test, "server1", slave_states);
     check_rlag(test, "server1", 0, 0);
+    // Rwsplit should detects that replication lag is 0.
+    test.try_query(maxconn, "SHOW DATABASES;");
+    mysql_close(maxconn);
+    test.log_includes(0, "is returned to query routing.");
 
     // Test over, reset topology.
     const char reset_with_name[] = "STOP SLAVE '%s'; RESET SLAVE '%s' ALL;";