diff --git a/test/helper.rb b/test/helper.rb
index <HASH>..<HASH> 100644
--- a/test/helper.rb
+++ b/test/helper.rb
@@ -30,7 +30,7 @@ if ActiveRecord::Base.respond_to?(:raise_in_transactional_callbacks=) && Rails.v
   ActiveRecord::Base.raise_in_transactional_callbacks = true
 end
 
-ActiveRecord::Base.configurations = { "test" => { adapter: 'sqlite3', database: ':memory:' } }
+ActiveRecord::Base.configurations = { 'test' => { 'adapter' => 'sqlite3', 'database' => ':memory:' } }
 ActiveRecord::Base.establish_connection(:test)
 
 ActiveRecord::Schema.verbose = false
Make DB configuration RoR <I> compatible.

The configuration does not accept symbols as a keys anymore, since
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