diff --git a/src/Helper/StringHelper.php b/src/Helper/StringHelper.php
index 16627ff..6d51b0a 100644
--- a/src/Helper/StringHelper.php
+++ b/src/Helper/StringHelper.php
@@ -468,7 +468,7 @@ public function isUtf8(): bool
      */
     public function toUtf8(): static
     {
-        if (!$this->isUtf8()) {
+        if (!$this->isUtf8() && !$this->isInt()) {
             $this->string = mb_convert_encoding($this->string, 'UTF-8', mb_list_encodings());
         }