diff --git a/www/nginx/src/opnsense/scripts/nginx/ngx_autoblock.php b/www/nginx/src/opnsense/scripts/nginx/ngx_autoblock.php
index 63e5c6f7a..d43ea8f98 100755
--- a/www/nginx/src/opnsense/scripts/nginx/ngx_autoblock.php
+++ b/www/nginx/src/opnsense/scripts/nginx/ngx_autoblock.php
@@ -113,7 +113,7 @@ function get_files_lastmodified(array $files): array
     // - No content => -1
     $times = [];
     foreach ($files as $file) {
-        $mtime = @filemtime($file) ?: rand();
+        $mtime = @filemtime($file) ?: random_int(0, getrandmax());
         $times[$file] = @filesize($file) === 0 ? -1 : $mtime;
     }
     return $times;