diff --git a/sql/sql_table.cc b/sql/sql_table.cc
index 9a68420e5fc..5363737998b 100644
--- a/sql/sql_table.cc
+++ b/sql/sql_table.cc
@@ -5958,6 +5958,7 @@ bool mysql_alter_table(THD *thd,char *new_db, char *new_name,
     case ENABLE:
       if (wait_while_table_is_used(thd, table, HA_EXTRA_FORCE_REOPEN))
         goto err;
+      DEBUG_SYNC(thd,"alter_table_enable_indexes");
       DBUG_EXECUTE_IF("sleep_alter_enable_indexes", my_sleep(6000000););
       error= table->file->ha_enable_indexes(HA_KEY_SWITCH_NONUNIQ_SAVE);
       break;