diff --git a/core/modules/file/file.field.inc b/core/modules/file/file.field.inc
index a46696c..08a6be3 100644
--- a/core/modules/file/file.field.inc
+++ b/core/modules/file/file.field.inc
@@ -372,7 +372,7 @@ function file_field_widget_value($element, $input = FALSE, $form_state) {
     // Checkboxes lose their value when empty.
     // If the display field is present make sure its unchecked value is saved.
     if (empty($input['display'])) {
-      $input['display'] = $element['#display_field'] ? 0 : 1;
+      $input['display'] = intval(empty($element['#display_field']));
     }
   }