diff --git a/src/Symfony/Component/DomCrawler/Crawler.php b/src/Symfony/Component/DomCrawler/Crawler.php
index 3f8d9ae58ccf..8743f1edef12 100644
--- a/src/Symfony/Component/DomCrawler/Crawler.php
+++ b/src/Symfony/Component/DomCrawler/Crawler.php
@@ -97,7 +97,7 @@ public function addContent($content, $type = null)
         }
 
         $charset = null;
-        if (false !== $pos = strpos($type, 'charset=')) {
+        if (false !== $pos = stripos($type, 'charset=')) {
             $charset = substr($type, $pos + 8);
             if (false !== $pos = strpos($charset, ';')) {
                 $charset = substr($charset, 0, $pos);
diff --git a/src/Symfony/Component/HttpFoundation/Response.php b/src/Symfony/Component/HttpFoundation/Response.php
index 0f00732f0844..9417248c53a9 100644
--- a/src/Symfony/Component/HttpFoundation/Response.php
+++ b/src/Symfony/Component/HttpFoundation/Response.php
@@ -223,7 +223,7 @@ public function prepare(Request $request)
         $charset = $this->charset ?: 'UTF-8';
         if (!$headers->has('Content-Type')) {
             $headers->set('Content-Type', 'text/html; charset='.$charset);
-        } elseif (0 === strpos($headers->get('Content-Type'), 'text/') && false === strpos($headers->get('Content-Type'), 'charset')) {
+        } elseif (0 === stripos($headers->get('Content-Type'), 'text/') && false === stripos($headers->get('Content-Type'), 'charset')) {
             // add the charset
             $headers->set('Content-Type', $headers->get('Content-Type').'; charset='.$charset);
         }