diff --git a/storage/blackhole/ha_blackhole.cc b/storage/blackhole/ha_blackhole.cc
index c3ee41b..3ab53b9 100644
--- a/storage/blackhole/ha_blackhole.cc
+++ b/storage/blackhole/ha_blackhole.cc
@@ -318,7 +318,7 @@ static int blackhole_init(void *p) {
   blackhole_hton->state = SHOW_OPTION_YES;
   blackhole_hton->db_type = DB_TYPE_BLACKHOLE_DB;
   blackhole_hton->create = blackhole_create_handler;
-  blackhole_hton->flags = HTON_CAN_RECREATE;
+  blackhole_hton->flags = HTON_CAN_RECREATE | HTON_ALTER_NOT_SUPPORTED;
 
   mysql_mutex_init(bh_key_mutex_blackhole, &blackhole_mutex,
                    MY_MUTEX_INIT_FAST);
diff --git a/storage/myisammrg/ha_myisammrg.cc b/storage/myisammrg/ha_myisammrg.cc
index 8ad2c13..1f072a6 100644
--- a/storage/myisammrg/ha_myisammrg.cc
+++ b/storage/myisammrg/ha_myisammrg.cc
@@ -1436,7 +1436,7 @@ static int myisammrg_init(void *p) {
   myisammrg_hton->db_type = DB_TYPE_MRG_MYISAM;
   myisammrg_hton->create = myisammrg_create_handler;
   myisammrg_hton->panic = myisammrg_panic;
-  myisammrg_hton->flags = HTON_NO_PARTITION;
+  myisammrg_hton->flags = HTON_NO_PARTITION | HTON_ALTER_NOT_SUPPORTED;
   myisammrg_hton->file_extensions = ha_myisammrg_exts;
   myisammrg_hton->rm_tmp_tables = default_rm_tmp_tables;