diff --git a/system/Helpers/url_helper.php b/system/Helpers/url_helper.php
index a392f01772df..20f1f471977e 100644
--- a/system/Helpers/url_helper.php
+++ b/system/Helpers/url_helper.php
@@ -422,9 +422,9 @@ function safe_mailto(string $email, string $title = '', $attributes = ''): strin
 			}
 			else
 			{
-				for ($i = 0, $l = strlen($attributes); $i < $l; $i ++)
+				for ($i = 0, $l = mb_strlen($attributes); $i < $l; $i ++)
 				{
-					$x[] = $attributes[$i];
+					$x[] = mb_substr($attributes, $i, 1);
 				}
 			}
 		}