diff --git a/lib/sequel/adapters/jdbc/mssql.rb b/lib/sequel/adapters/jdbc/mssql.rb
index 5ea91d5..0c38be5 100644
--- a/lib/sequel/adapters/jdbc/mssql.rb
+++ b/lib/sequel/adapters/jdbc/mssql.rb
@@ -70,6 +70,16 @@ module Sequel
       # Dataset class for MSSQL datasets accessed via JDBC.
       class Dataset < JDBC::Dataset
         include Sequel::MSSQL::DatasetMethods
+
+        def convert_type(v)
+          case v
+          when Java::NetSourceforgeJtdsJdbc::ClobImpl
+            convert_type(v.getSubString(1, v.length))
+          else
+            super(v)
+          end
+        end
+
       end
     end
   end