diff --git a/lib/generators/active_record/impressionist_generator.rb b/lib/generators/active_record/impressionist_generator.rb
index 1c899782..c9f517eb 100644
--- a/lib/generators/active_record/impressionist_generator.rb
+++ b/lib/generators/active_record/impressionist_generator.rb
@@ -7,7 +7,7 @@ class ImpressionistGenerator < Rails::Generators::Base
       # FIX, why is this implementing rails behaviour?
       def self.next_migration_number(dirname)
         sleep 1
-        if ActiveRecord::Base.timestamped_migrations
+        if timestamped_migrations?
           Time.now.utc.strftime("%Y%m%d%H%M%S")
         else
           "%.3d" % (current_migration_number(dirname) + 1)
@@ -17,6 +17,18 @@ def self.next_migration_number(dirname)
       def create_migration_file
         migration_template 'create_impressions_table.rb.erb', 'db/migrate/create_impressions_table.rb'
       end
+
+      class << self
+        private
+
+        def timestamped_migrations?
+          if Rails::VERSION::MAJOR >= 7
+            ActiveRecord.timestamped_migrations
+          else
+            ActiveRecord::Base.timestamped_migrations
+          end
+        end
+      end
     end
   end
 end