diff --git a/admin/upload.php b/admin/upload.php
index e84e61f..dc2e239 100644
--- a/admin/upload.php
+++ b/admin/upload.php
@@ -1,7 +1,7 @@
 <?php
 
 function hashedName($fileName) {
-  return base64_encode(mhash(MHASH_ADLER32, $fileName));
+  return strtolower(bin2hex(mhash(MHASH_ADLER32, $fileName)));
 }
 
 $target_dir = __DIR__ . "/../slike/";