diff --git a/lib/Core/Provider/Cloudinary/Factory/Md5FileHash.php b/lib/Core/Provider/Cloudinary/Factory/Md5FileHash.php
index d89c0be8..9fd2ee38 100644
--- a/lib/Core/Provider/Cloudinary/Factory/Md5FileHash.php
+++ b/lib/Core/Provider/Cloudinary/Factory/Md5FileHash.php
@@ -14,6 +14,8 @@
 use function curl_init;
 use function curl_setopt;
 use function explode;
+use function mb_strlen;
+use function mb_strtolower;
 use function trim;
 
 use const CURLINFO_HTTP_CODE;