diff --git a/activerecord/.gitignore b/activerecord/.gitignore
index 884ee009eb..effb81c892 100644
--- a/activerecord/.gitignore
+++ b/activerecord/.gitignore
@@ -1,3 +1,4 @@
+/db/
 /sqlnet.log
 /test/config.yml
 /test/fixtures/*.sqlite*
diff --git a/activerecord/test/cases/adapters/sqlite3/transaction_test.rb b/activerecord/test/cases/adapters/sqlite3/transaction_test.rb
index 570959acf4..7888bbbf49 100644
--- a/activerecord/test/cases/adapters/sqlite3/transaction_test.rb
+++ b/activerecord/test/cases/adapters/sqlite3/transaction_test.rb
@@ -108,7 +108,7 @@ class SQLite3TransactionTest < ActiveRecord::SQLite3TestCase
     def with_connection(options = {})
       db_config = ActiveRecord::Base.configurations.configs_for(env_name: "arunit", name: "primary")
       conn_options = options.reverse_merge(
-        database: in_memory_db? ? "file::memory:" : db_config.database
+        database: in_memory_db? ? "db/file::memory:" : db_config.database
       )
       conn = ActiveRecord::Base.sqlite3_connection(conn_options)