diff --git a/app/models/return-version.model.js b/app/models/return-version.model.js
index e3946f274a..5739cb696a 100644
--- a/app/models/return-version.model.js
+++ b/app/models/return-version.model.js
@@ -14,6 +14,13 @@ class ReturnVersionModel extends BaseModel {
     return 'returnVersions'
   }
 
+  // Defining which fields contain json allows us to insert an object without needing to stringify it first
+  static get jsonAttributes () {
+    return [
+      'mod_logs'
+    ]
+  }
+
   static get relationMappings () {
     return {
       licence: {