diff --git a/inc/page.php b/inc/page.php
index 99ba862..1bd5728 100644
--- a/inc/page.php
+++ b/inc/page.php
@@ -618,9 +618,9 @@ class Page {
 
     function append_param($url, $param) {
         if (preg_match("/\?[a-z]+=/", $url)) {
-            return "${url}&${param}";
+            return "{$url}&{$param}";
         }
-        return "${url}?${param}";
+        return "{$url}?{$param}";
     }
 
     function link($url) {
diff --git a/index.php b/index.php
index d6fe93d..d2a2663 100644
--- a/index.php
+++ b/index.php
@@ -7,7 +7,7 @@ if ($page->settings->simple_urls && count($_GET) !== 0) {
     $target = $page->get_requested_page();
 
     if ($target !== "index" && strlen($target) <= 16 && preg_match("/^[a-z]+$/", $target)) {
-        $local_script = "./${target}.php";
+        $local_script = "./{$target}.php";
         if (file_exists($local_script)) {
             require_once $local_script;
             return;