diff --git a/lib/active_record/connection_adapters/sqlserver/database_statements.rb b/lib/active_record/connection_adapters/sqlserver/database_statements.rb
index 0b6f95ec2..3b9efbf3d 100644
--- a/lib/active_record/connection_adapters/sqlserver/database_statements.rb
+++ b/lib/active_record/connection_adapters/sqlserver/database_statements.rb
@@ -325,7 +325,7 @@ def sp_executesql_types_and_parameters(binds)
         end
 
         def sp_executesql_sql_type(attr)
-          return "nvarchar(max)".freeze if attr.is_a?(Symbol)
+          return "nvarchar(max)".freeze if attr.is_a?(Symbol) || attr.is_a?(String)
           return attr.type.sqlserver_type if attr.type.respond_to?(:sqlserver_type)
 
           case value = attr.value_for_database
@@ -337,7 +337,7 @@ def sp_executesql_sql_type(attr)
         end
 
         def sp_executesql_sql_param(attr)
-          return quote(attr) if attr.is_a?(Symbol)
+          return quote(attr) if attr.is_a?(Symbol) || attr.is_a?(String)
 
           case value = attr.value_for_database
           when Type::Binary::Data,