diff --git a/phpBB/includes/functions.php b/phpBB/includes/functions.php
index 51f5bc0fd5..1457888c9f 100644
--- a/phpBB/includes/functions.php
+++ b/phpBB/includes/functions.php
@@ -115,7 +115,7 @@ function gen_rand_string_friendly($num_chars = 8)
 */
 function unique_id()
 {
-	return bin2hex(random_bytes(8));
+	return gen_rand_string(32);
 }
 
 /**