diff --git a/base.php b/base.php
index 96e074d..a2c8331 100644
--- a/base.php
+++ b/base.php
@@ -46,6 +46,13 @@ function getQueryString () {
     return "";
 }
 
+function notFound () {
+    header($_SERVER["SERVER_PROTOCOL"]." 404 Not Found");
+    header("Status: 404 Not Found");
+
+    $_SERVER['REDIRECT_STATUS'] = 404;
+}
+
 function getURLParam ($name, $default = NULL) {
     if (!empty ($_GET) && isset($_GET[$name]) && $_GET[$name] != "") {
         return $_GET[$name];
diff --git a/epubfs.php b/epubfs.php
index baecf9c..309a42f 100644
--- a/epubfs.php
+++ b/epubfs.php
@@ -5,13 +5,6 @@ require_once ("base.php");
 require_once ("book.php");
 require_once ("resources/php-epub-meta/epub.php");
 
-function notFound () {
-    header($_SERVER["SERVER_PROTOCOL"]." 404 Not Found");
-    header("Status: 404 Not Found");
-
-    $_SERVER['REDIRECT_STATUS'] = 404;
-}
-
 function getComponentContent ($book, $component, $add) {
     $data = $book->component ($component);
 
diff --git a/fetch.php b/fetch.php
index 1d15e3c..6386590 100644
--- a/fetch.php
+++ b/fetch.php
@@ -10,13 +10,6 @@
     require_once ("book.php");
     require_once ("data.php");
 
-function notFound () {
-    header($_SERVER["SERVER_PROTOCOL"]." 404 Not Found");
-    header("Status: 404 Not Found");
-
-    $_SERVER['REDIRECT_STATUS'] = 404;
-}
-
     global $config;
 
     if ($config ['cops_fetch_protect'] == "1") {