diff --git a/components/grid.inc b/components/grid.inc
index 0ddcf11..955c526 100644
--- a/components/grid.inc
+++ b/components/grid.inc
@@ -69,6 +69,7 @@ function _webform_edit_grid($component) {
       '#options' => _webform_select_options_from_text($component['extra']['options'], TRUE),
       '#optgroups' => FALSE,
       '#default_value' => FALSE,
+      '#default_value_allowed' => FALSE,
       '#optgroups' => FALSE,
       '#key_type' => 'mixed',
       '#key_type_toggle' => t('Customize option keys (Advanced)'),
@@ -88,6 +89,7 @@ function _webform_edit_grid($component) {
       '#options' => _webform_select_options_from_text($component['extra']['questions'], TRUE),
       '#optgroups' => FALSE,
       '#default_value' => FALSE,
+      '#default_value_allowed' => FALSE,
       '#optgroups' => FALSE,
       '#key_type' => 'mixed',
       '#key_type_toggle' => t('Customize question keys (Advanced)'),