1 files changed, 4 insertions, 0 deletions
diff --git a/activerecord/lib/active_record/connection_adapters/abstract_adapter.rb b/activerecord/lib/active_record/connection_adapters/abstract_adapter.rb
index 808de5daca..6b14a498df 100644
--- a/activerecord/lib/active_record/connection_adapters/abstract_adapter.rb
+++ b/activerecord/lib/active_record/connection_adapters/abstract_adapter.rb
@@ -509,6 +509,10 @@ module ActiveRecord
         result
       end
 
+      def default_index_type?(index) # :nodoc:
+        index.using.nil?
+      end
+
       private
 
         def initialize_type_map(m)