diff --git a/src/Forms/RequiredFields.php b/src/Forms/RequiredFields.php
index 918a32a11..96d570ec8 100644
--- a/src/Forms/RequiredFields.php
+++ b/src/Forms/RequiredFields.php
@@ -104,6 +104,9 @@ class RequiredFields extends Validator
                 $fieldName = $fieldName->getName();
             } else {
                 $formField = $fields->dataFieldByName($fieldName);
+                if (is_null($formField)) {
+                    $formField = $fields->dataFieldByName($fieldName . 'ID');
+                }
             }
 
             // submitted data for file upload fields come back as an array