diff --git a/config/set/php86.php b/config/set/php86.php
index dd823ce93b7..97225a343b2 100644
--- a/config/set/php86.php
+++ b/config/set/php86.php
@@ -5,7 +5,17 @@
 use Rector\Config\RectorConfig;
 use Rector\Php86\Rector\Class_\ConstructorReadonlyAssignToDefaultRector;
 use Rector\Php86\Rector\FuncCall\MinMaxToClampRector;
+use Rector\Renaming\Rector\FuncCall\RenameFunctionRector;
 
 return static function (RectorConfig $rectorConfig): void {
     $rectorConfig->rules([MinMaxToClampRector::class, ConstructorReadonlyAssignToDefaultRector::class]);
+
+    // https://wiki.php.net/rfc/deprecations_php_8_6 - deprecated function aliases
+    $rectorConfig->ruleWithConfiguration(RenameFunctionRector::class, [
+        'is_integer' => 'is_int',
+        'is_long' => 'is_int',
+        'is_double' => 'is_float',
+        'doubleval' => 'floatval',
+        '_' => 'gettext',
+    ]);
 };