diff --git a/svg.php b/svg.php
index 684b811..f81b3c2 100644
--- a/svg.php
+++ b/svg.php
@@ -63,7 +63,7 @@ class SVG {
      */
     public function out() {
         $this->setStyle();
-        header('image/svg+xml');
+        header('Content-Type: image/svg+xml');
         echo $this->xml->asXML();
     }