diff --git a/app/models/dmsf_query.rb b/app/models/dmsf_query.rb
index 6a69aec4..a6bc2c74 100644
--- a/app/models/dmsf_query.rb
+++ b/app/models/dmsf_query.rb
@@ -204,10 +204,10 @@ class DmsfQuery < Query
         select(%{
           dmsf_links.id AS id,
           COALESCE(dmsf_folders.project_id, dmsf_links.project_id) AS project_id,
-          NULL AS revision_id,
+          CAST(NULL AS #{ActiveRecord::Base.connection.type_to_sql(:decimal)}) AS revision_id,
           dmsf_links.name AS title,
           dmsf_folders.title AS filename,
-          NULL AS size,
+          CAST(NULL AS #{ActiveRecord::Base.connection.type_to_sql(:decimal)}) AS size,
           COALESCE(dmsf_folders.updated_at, dmsf_links.updated_at) AS updated,
           NULL AS major_version,
           NULL AS minor_version,
@@ -307,10 +307,10 @@ class DmsfQuery < Query
         select(%{
           dmsf_links.id AS id,
           dmsf_links.project_id AS project_id,
-          NULL AS revision_id,
+          CAST(NULL AS #{ActiveRecord::Base.connection.type_to_sql(:decimal)}) AS revision_id,
           dmsf_links.name AS title,
           dmsf_links.external_url AS filename,
-          NULL AS size,
+          CAST(NULL AS #{ActiveRecord::Base.connection.type_to_sql(:decimal)}) AS size,
           dmsf_links.updated_at AS updated,
 	        NULL AS major_version,
           NULL AS minor_version,