diff --git a/mysql-test/include/delete_use_source_cases.inc b/mysql-test/include/delete_use_source_cases.inc
index 24408b7dd50..ce0507d56b1 100644
--- a/mysql-test/include/delete_use_source_cases.inc
+++ b/mysql-test/include/delete_use_source_cases.inc
@@ -156,10 +156,12 @@ delimiter ;//
 set @a:=7;
 create table tmp as select * from t1 where c3 < @a
   order by c3 limit 1;
+--disable_ps2_protocol # because SELECT with side effects
 select f1(@a);
 insert into tmp(c1,c2,c3) select * from t1 where c3 < @a
   order by c3 limit 1;
 select f1(@a);
+--enable_ps2_protocol
 --sorted_result
 select * from t1;
 insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
diff --git a/mysql-test/include/delete_use_source_cases_memory.inc b/mysql-test/include/delete_use_source_cases_memory.inc
index 7a61b59e2a5..e1b49f54e82 100644
--- a/mysql-test/include/delete_use_source_cases_memory.inc
+++ b/mysql-test/include/delete_use_source_cases_memory.inc
@@ -195,10 +195,12 @@ delimiter ;//
 set @a:=7;
 create table tmp as select * from t1 where c3 < @a
   order by c3 limit 1;
+--disable_ps2_protocol # because SELECT with side effects
 select f1(@a);
 insert into tmp(c1,c2,c3) select * from t1 where c3 < @a
   order by c3 limit 1;
 select f1(@a);
+--enable_ps2_protocol
 --sorted_result
 select * from t1;
 insert into t1(c1,c2,c3) select c1,c2,c3 from tmp;
diff --git a/mysql-test/main/update.test b/mysql-test/main/update.test
index 89bc71dc695..f24bf9b140a 100644
--- a/mysql-test/main/update.test
+++ b/mysql-test/main/update.test
@@ -708,6 +708,7 @@ drop table t1;
 --echo # MDEV-29189: Second execution of SF using UPDATE?DELETE
 --echo #             after reported error by the first execution
 --echo #
+--disable_ps2_protocol # because SELECT with side effects
 
 CREATE TABLE t1 (c int);
 
@@ -739,5 +740,6 @@ SELECT * FROM t1;
 DROP FUNCTION f1;
 DROP FUNCTION f2;
 DROP TABLE t1;
+--enable_ps2_protocol
 
 --echo # End of MariaDB 10.10 tests