diff --git a/toolkit/components/reader/content/aboutReader.html b/toolkit/components/reader/content/aboutReader.html
index 955ce17dea8e..898a3938e21b 100644
--- a/toolkit/components/reader/content/aboutReader.html
+++ b/toolkit/components/reader/content/aboutReader.html
@@ -2,7 +2,7 @@
 <html>
 
 <head>
-  <meta content="text/html; charset=UTF-8" http-equiv="content-type">
+  <meta content="text/html; charset=UTF-8" http-equiv="content-type" />
   <meta name="viewport" content="width=device-width; user-scalable=0" />
 
   <link rel="stylesheet" href="chrome://global/skin/aboutReader.css" type="text/css"/>
