diff --git a/index.php b/index.php
index 6a22d5471..90ff8bbec 100644
--- a/index.php
+++ b/index.php
@@ -39,7 +39,7 @@
 	<title>Tiny Tiny RSS</title>
     <meta name="viewport" content="initial-scale=1,width=device-width" />
 
-	<?php if ($_SESSION["uid"]) {
+	<?php if ($_SESSION["uid"] && !isset($_REQUEST["ignore-theme"])) {
 		$theme = get_pref("USER_CSS_THEME", false, false);
 		if ($theme && theme_exists("$theme")) {
 			echo stylesheet_tag(get_theme_path($theme), 'theme_css');
diff --git a/prefs.php b/prefs.php
index 22921b23f..12976ad8f 100644
--- a/prefs.php
+++ b/prefs.php
@@ -31,7 +31,7 @@
 	<title>Tiny Tiny RSS : <?php echo __("Preferences") ?></title>
     <meta name="viewport" content="initial-scale=1,width=device-width" />
 
-	<?php if ($_SESSION["uid"]) {
+	<?php if ($_SESSION["uid"] && !isset($_REQUEST["ignore-theme"])) {
 		$theme = get_pref("USER_CSS_THEME", false, false);
 		if ($theme && theme_exists("$theme")) {
 			echo stylesheet_tag(get_theme_path($theme), 'theme_css');