diff --git a/js/dropdown-widget.js b/js/dropdown-widget.js
index 8eb113f..6a3aaa8 100644
--- a/js/dropdown-widget.js
+++ b/js/dropdown-widget.js
@@ -7,7 +7,7 @@
 
     "use strict";
 
-    var $dropdown = '<select class="facets-dropdown">';
+    var $dropdown = '';
 
     Drupal.facets = {};
     Drupal.behaviors.facetsDropdownWidget = {
@@ -20,6 +20,14 @@
      * Turns all facet links into options.
      */
     Drupal.facets.makeDropdown = function () {
+        var is_multiple = $('.js-facets-dropdown-links').data('multiple');
+
+        $dropdown = '<select class="facets-dropdown"';
+        if (is_multiple == 1) {
+          $dropdown += ' multiple'
+        }
+        $dropdown += '>';
+
         // Find all dropdown facet links and turn them into an option.
         var $links = $('.js-facets-dropdown-links .facet-item');
 
diff --git a/src/Plugin/facets/widget/DropdownWidget.php b/src/Plugin/facets/widget/DropdownWidget.php
index 0e48bdc..97c854e 100644
--- a/src/Plugin/facets/widget/DropdownWidget.php
+++ b/src/Plugin/facets/widget/DropdownWidget.php
@@ -51,7 +51,10 @@ class DropdownWidget extends LinksWidget{
     $build = [
       '#theme' => 'item_list',
       '#items' => $items,
-      '#attributes' => ['class' => ['js-facets-dropdown-links']],
+      '#attributes' => [
+        'class' => ['js-facets-dropdown-links'],
+        'data-multiple' => $facet->getShowOnlyOneResult() ? 0 : 1,
+      ],
       '#cache' => [
         'contexts' => [
           'url.path',
diff --git a/tests/src/Unit/Plugin/widget/CheckboxWidgetTest.php b/tests/src/Unit/Plugin/widget/CheckboxWidgetTest.php
index 8fc63da..6ee5320 100644
--- a/tests/src/Unit/Plugin/widget/CheckboxWidgetTest.php
+++ b/tests/src/Unit/Plugin/widget/CheckboxWidgetTest.php
@@ -14,12 +14,12 @@ use Drupal\Tests\UnitTestCase;
  *
  * @group facets
  */
-class CheckboxWidgetTest extends UnitTestCase {
+class DropdownWidgetTest extends UnitTestCase {
 
   /**
    * The processor to be tested.
    *
-   * @var \Drupal\facets\Plugin\facets\widget\CheckboxWidget
+   * @var \Drupal\facets\Plugin\facets\widget\DropdownWidget
    */
   protected $widget;
 
diff --git a/tests/src/Unit/Plugin/widget/SelectWidgetTest.php b/tests/src/Unit/Plugin/widget/DropdownWidgetTest.php
similarity index 82%
rename from tests/src/Unit/Plugin/widget/SelectWidgetTest.php
rename to tests/src/Unit/Plugin/widget/DropdownWidgetTest.php
index 6ef4664..e411814 100644
--- a/tests/src/Unit/Plugin/widget/SelectWidgetTest.php
+++ b/tests/src/Unit/Plugin/widget/DropdownWidgetTest.php
@@ -84,6 +84,27 @@ class SelectWidgetTest extends UnitTestCase {
   }
 
   /**
+   * Tests multiple.
+   */
+  public function testMultiple() {
+    $facet = new Facet([], 'facet');
+    $output = $this->widget->build($facet);
+
+    $this->assertInternalType('array', $output);
+    $this->assertEquals(['js-facets-dropdown-links'], $output['#attributes']['class']);
+    $this->assertEquals(1, $output['#attributes']['data-multiple']);
+
+    $facet = new Facet([], 'facet');
+    $facet->setShowOnlyOneResult(TRUE);
+    $output = $this->widget->build($facet);
+
+    $this->assertInternalType('array', $output);
+    $this->assertEquals(['js-facets-dropdown-links'], $output['#attributes']['class']);
+    $this->assertEquals(0, $output['#attributes']['data-multiple']);
+  }
+
+
+  /**
    * Build a formattable markup object to use in the other tests.
    *
    * @param string $text