diff --git a/script/import_scripts/base.rb b/script/import_scripts/base.rb
index 6334fbfeb..4895661f6 100644
--- a/script/import_scripts/base.rb
+++ b/script/import_scripts/base.rb
@@ -80,6 +80,7 @@ class ImportScripts::Base
 
     update_bumped_at
     update_last_posted_at
+    update_last_seen_at
     update_feature_topic_users
     update_category_featured_topics
     update_topic_count_replies
@@ -508,6 +509,14 @@ class ImportScripts::Base
     User.exec_sql(sql)
   end
 
+  # scripts that are able to import last_seen_at from the source data should override this method
+  def update_last_seen_at
+    puts "", "updating last seen at on users"
+
+    User.exec_sql("UPDATE users SET last_seen_at = created_at WHERE last_seen_at IS NULL")
+    User.exec_sql("UPDATE users SET last_seen_at = last_posted_at WHERE last_posted_at IS NOT NULL")
+  end
+
   def update_feature_topic_users
     puts "", "updating featured topic users"