diff --git a/src/Plugin/Field/FieldWidget/WidgetBase.php b/src/Plugin/Field/FieldWidget/WidgetBase.php
index cc59173..b5828e4 100644
--- a/src/Plugin/Field/FieldWidget/WidgetBase.php
+++ b/src/Plugin/Field/FieldWidget/WidgetBase.php
@@ -172,6 +172,13 @@ abstract class WidgetBase extends CoreWidgetBase {
     return $element;
   }
 
+  /**
+   * Remove accents before sorting.
+   */
+  private function removeAccents($string) {
+    return strtolower(trim(preg_replace('~[^0-9a-z]+~i', '-', preg_replace('~&([a-z]{1,2})(acute|cedil|circ|grave|lig|orn|ring|slash|th|tilde|uml);~i', '$1', htmlentities($string, ENT_QUOTES, 'UTF-8'))), ' '));
+  }
+
   /**
    * Adds the available options to the select or other element.
    *
@@ -184,10 +191,16 @@ abstract class WidgetBase extends CoreWidgetBase {
   private function sortOptions($options) {
     if ($direction = $this->getSetting('sort_options')) {
       if ($direction === 'ASC') {
-        uasort($options, 'strcasecmp');
+        uasort($options, function ($a, $b) {
+          $a = $this->removeAccents($a);
+          $b = $this->removeAccents($b);
+          return 1 * strcasecmp($a, $b);
+        });
       }
       elseif ($direction === 'DESC') {
         uasort($options, function ($a, $b) {
+          $a = $this->removeAccents($a);
+          $b = $this->removeAccents($b);
           return -1 * strcasecmp($a, $b);
         });
       }