1 files changed, 4 insertions, 0 deletions
diff --git a/activerecord/lib/active_record/connection_adapters/type/decimal.rb b/activerecord/lib/active_record/connection_adapters/type/decimal.rb
index 6fb1a6c3b0..ac5af4b963 100644
--- a/activerecord/lib/active_record/connection_adapters/type/decimal.rb
+++ b/activerecord/lib/active_record/connection_adapters/type/decimal.rb
@@ -8,6 +8,10 @@ module ActiveRecord
           :decimal
         end
 
+        def klass
+          ::BigDecimal
+        end
+
         private
 
         def cast_value(value)