diff --git a/inc/page.php b/inc/page.php
index 599d468..743d153 100644
--- a/inc/page.php
+++ b/inc/page.php
@@ -621,7 +621,7 @@ class Page {
         $time = microtime(true) - $this->time;
         echo "<!-- Page generated in $time seconds. -->";
 
-        include_once './inc/footer.php';
+        require_once './inc/footer.php';
     }
 
     function append_param($url, $param) {
diff --git a/inc/test/php/LangTest.php b/inc/test/php/LangTest.php
index 06e145a..5e20f88 100644
--- a/inc/test/php/LangTest.php
+++ b/inc/test/php/LangTest.php
@@ -9,7 +9,7 @@ final class LangTest extends TestCase {
         $dir = './lang';
         $langs = glob("$dir/*.php");
         foreach ($langs as $lang) {
-            include_once $lang;
+            require_once $lang;
             $lang_class = $lang;
             $lang_class = substr($lang_class, strlen("$dir/")); // grab "en_US.utf8.php" from "./lang/en_US.utf8.php"
             $lang_class = substr($lang_class, 0, strpos($lang_class, ".")); // grab "en_US" from "en_US.utf8.php"
diff --git a/inc/test/php/PageTest.php b/inc/test/php/PageTest.php
index 37f9156..e8d5932 100644
--- a/inc/test/php/PageTest.php
+++ b/inc/test/php/PageTest.php
@@ -2,7 +2,7 @@
 
 use PHPUnit\Framework\TestCase;
 
-include_once './inc/page.php';
+require_once './inc/page.php';
 
 final class PageTest extends TestCase {
     public function testBansPagerHTML(): void {
diff --git a/index.php b/index.php
index de837ae..7ca0b66 100644
--- a/index.php
+++ b/index.php
@@ -8,7 +8,7 @@ if ($page->settings->simple_urls && count($_GET) !== 0) {
     if ($target !== "index" && strlen($target) <= 16 && preg_match("/^[a-z]+$/", $target)) {
         $local_script = "./${target}.php";
         if (file_exists($local_script)) {
-            include_once $local_script;
+            require_once $local_script;
             return;
         }
     }