diff --git a/index.php b/index.php
index 526ebe772..d0369e808 100644
--- a/index.php
+++ b/index.php
@@ -98,7 +98,7 @@
 	<script type="text/javascript">
 		require({cache:{}});
 	<?php
-		require 'lib/jshrink/Minifier.php';
+		require_once 'lib/jshrink/Minifier.php';
 
 		print get_minified_js(array("tt-rss",
 			"functions", "feedlist", "viewfeed", "FeedTree", "PluginHost"));
diff --git a/prefs.php b/prefs.php
index fcf21cf2e..6c203bd2a 100644
--- a/prefs.php
+++ b/prefs.php
@@ -64,7 +64,7 @@
 	<script type="text/javascript">
 		require({cache:{}});
 	<?php
-		require 'lib/jshrink/Minifier.php';
+		require_once 'lib/jshrink/Minifier.php';
 
 		foreach (PluginHost::getInstance()->get_plugins() as $n => $p) {
 			if (method_exists($p, "get_prefs_js")) {