diff --git a/maxscale-system-test/masking/masking_mysqltest/r/masking_mxs1733.result b/maxscale-system-test/masking/masking_mysqltest/r/masking_mxs1733.result
index b4f053eaa..3cf294fcf 100644
--- a/maxscale-system-test/masking/masking_mysqltest/r/masking_mxs1733.result
+++ b/maxscale-system-test/masking/masking_mysqltest/r/masking_mxs1733.result
@@ -6,6 +6,3 @@ insert into masking_mxs1733 values ("john@example.com");
 select * from masking_mxs1733;
 email
 ****************
-select * from masking_mxs1733 UNION select * from masking_mxs1733;
-email
-****************
diff --git a/maxscale-system-test/masking/masking_mysqltest/t/masking_mxs1733.test b/maxscale-system-test/masking/masking_mysqltest/t/masking_mxs1733.test
index acb4b6d97..4b66aab57 100644
--- a/maxscale-system-test/masking/masking_mysqltest/t/masking_mxs1733.test
+++ b/maxscale-system-test/masking/masking_mysqltest/t/masking_mxs1733.test
@@ -14,4 +14,3 @@ create table masking_mxs1733 (email TEXT);
 insert into masking_mxs1733 values ("john@example.com");
 
 select * from masking_mxs1733;
-select * from masking_mxs1733 UNION select * from masking_mxs1733;