diff --git a/lib/Doctrine/Inflector/Rules/Portuguese/Inflectible.php b/lib/Doctrine/Inflector/Rules/Portuguese/Inflectible.php
index 95564d49..a6a9b347 100644
--- a/lib/Doctrine/Inflector/Rules/Portuguese/Inflectible.php
+++ b/lib/Doctrine/Inflector/Rules/Portuguese/Inflectible.php
@@ -54,7 +54,7 @@ public static function getPlural(): iterable
         yield new Transformation(new Pattern('/el$/i'), 'eis');
         yield new Transformation(new Pattern('/al$/i'), 'ais');
         yield new Transformation(new Pattern('/(z|r)$/i'), '\1es');
-        yield new Transformation(new Pattern('/(s)$/i'), '\1');
+        yield new Transformation(new Pattern('/(s|x)$/i'), '\1');
         yield new Transformation(new Pattern('/$/'), 's');
     }
 
diff --git a/lib/Doctrine/Inflector/Rules/Portuguese/Uninflected.php b/lib/Doctrine/Inflector/Rules/Portuguese/Uninflected.php
index 58c34f9b..9ce3a278 100644
--- a/lib/Doctrine/Inflector/Rules/Portuguese/Uninflected.php
+++ b/lib/Doctrine/Inflector/Rules/Portuguese/Uninflected.php
@@ -29,10 +29,8 @@ public static function getPlural(): iterable
      */
     private static function getDefault(): iterable
     {
-        yield new Pattern('tórax');
         yield new Pattern('tênis');
         yield new Pattern('ônibus');
         yield new Pattern('lápis');
-        yield new Pattern('fênix');
     }
 }