diff --git a/maxscale-system-test/different_size_rwsplit.cpp b/maxscale-system-test/different_size_rwsplit.cpp
index 33400406b..a3a1b804a 100644
--- a/maxscale-system-test/different_size_rwsplit.cpp
+++ b/maxscale-system-test/different_size_rwsplit.cpp
@@ -19,6 +19,7 @@ int main(int argc, char *argv[])
 
     different_packet_size(Test, false);
 
+    Test->repl->sync_slaves();
     Test->check_maxscale_alive(0);
     int rval = Test->global_result;
     delete Test;