diff --git a/changelogs/unreleased/rails5-mysql-rename-column.yml b/changelogs/unreleased/rails5-mysql-rename-column.yml
new file mode 100644
index 00000000000..cbae9250744
--- /dev/null
+++ b/changelogs/unreleased/rails5-mysql-rename-column.yml
@@ -0,0 +1,5 @@
+---
+title: Rails5 MySQL fix rename_column as part of cleanup_concurrent_column_type_change
+merge_request: 20514
+author: Jasper Maes
+type: fixed
diff --git a/config/initializers/active_record_table_definition.rb b/config/initializers/active_record_table_definition.rb
index 8e3a1c7a62f..a71069f27a3 100644
--- a/config/initializers/active_record_table_definition.rb
+++ b/config/initializers/active_record_table_definition.rb
@@ -29,6 +29,11 @@ module ActiveRecord
       def datetime_with_timezone(column_name, **options)
         column(column_name, :datetime_with_timezone, options)
       end
+
+      # Disable timestamp alias to datetime
+      def aliased_types(name, fallback)
+        fallback
+      end
     end
   end
 end