diff --git a/storage/innobase/handler/handler0alter.cc b/storage/innobase/handler/handler0alter.cc
index f4003dc..6b8c2ec 100644
--- a/storage/innobase/handler/handler0alter.cc
+++ b/storage/innobase/handler/handler0alter.cc
@@ -8567,9 +8567,8 @@ class alter_part_normal : public alter_part {
                  dd::Partition *new_part) override {
     ut_ad(m_old != nullptr);
 
-    btr_drop_ahi_for_table(*m_old);
-
     mutex_enter(&dict_sys->mutex);
+    btr_drop_ahi_for_table(*m_old);
     dd_table_close(*m_old, nullptr, nullptr, true);
     dict_table_remove_from_cache(*m_old);
     *m_old = nullptr;