diff --git a/activerecord/lib/active_record/connection_adapters/abstract/database_statements.rb b/activerecord/lib/active_record/connection_adapters/abstract/database_statements.rb
index def1dadb6a458b3684199df38cef7cc37dfd6900..aa2dfdd57324656cbdd51b08f240f135a0a03d58 100644
--- a/activerecord/lib/active_record/connection_adapters/abstract/database_statements.rb
+++ b/activerecord/lib/active_record/connection_adapters/abstract/database_statements.rb
@@ -245,7 +245,7 @@ def transaction_open?
       end
 
       def reset_transaction #:nodoc:
-        @transaction_manager = TransactionManager.new(self)
+        @transaction_manager = ConnectionAdapters::TransactionManager.new(self)
       end
 
       # Register a record with the current transaction so that its after_commit and after_rollback callbacks