diff --git a/doxygen/docs_header.html b/doxygen/docs_header.html
index 4b13e6960ef..15796f939a6 100644
--- a/doxygen/docs_header.html
+++ b/doxygen/docs_header.html
@@ -4,6 +4,7 @@
 <head>
 <meta http-equiv="Content-Type" content="text/xhtml;charset=UTF-8"/>
 <meta http-equiv="X-UA-Compatible" content="IE=9"/>
+<meta http-equiv="Content-Security-Policy" content="default-src 'self'; upgrade-insecure-requests;"/>
 <meta name="generator" content="Doxygen $doxygenversion"/>
 <meta name="viewport" content="width=device-width, initial-scale=1"/>
 <!--BEGIN PROJECT_NAME--><title>$projectname: $title</title><!--END PROJECT_NAME-->
