diff --git a/phpBB/includes/functions.php b/phpBB/includes/functions.php
index be51a7342d..c9f2601e31 100644
--- a/phpBB/includes/functions.php
+++ b/phpBB/includes/functions.php
@@ -96,7 +96,7 @@ function gen_rand_string_friendly($num_chars = 8)
 */
 function unique_id()
 {
-	return bin2hex(random_bytes(6));
+	return bin2hex(random_bytes(8));
 }
 
 /**