diff --git a/core/includes/form.inc b/core/includes/form.inc
index 27f450e..118b945 100644
--- a/core/includes/form.inc
+++ b/core/includes/form.inc
@@ -4304,14 +4304,14 @@ function form_pre_render_tel($element) {
  * @param array $element
  *   An associative array containing the properties of the element.
  *   Properties used: #title, #value, #description, #min, #max, #placeholder,
- *   #required, #attributes, #step.
+ *   #required, #attributes, #step, #size.
  *
  * @return array
  *   The $element with prepared variables ready for theme_input().
  */
 function form_pre_render_number($element) {
   $element['#attributes']['type'] = 'number';
-  element_set_attributes($element, array('id', 'name', 'value', 'step', 'min', 'max', 'placeholder'));
+  element_set_attributes($element, array('id', 'name', 'value', 'step', 'min', 'max', 'placeholder', 'size'));
   _form_set_attributes($element, array('form-number'));
 
   return $element;
diff --git a/core/modules/field_ui/field_ui.admin.inc b/core/modules/field_ui/field_ui.admin.inc
index 187936d..7419b97 100644
--- a/core/modules/field_ui/field_ui.admin.inc
+++ b/core/modules/field_ui/field_ui.admin.inc
@@ -546,6 +546,7 @@ function field_ui_field_settings_form($form, &$form_state, $instance) {
     '#min' => 1,
     '#title' => t('Number'),
     '#title_display' => 'invisible',
+    '#size' => 5,
     '#suffix' => '</div>',
     '#states' => array(
       'visible' => array(