diff --git a/include/security_headers_middleware.hpp b/include/security_headers_middleware.hpp
index 237438b..5e8e7d9 100644
--- a/include/security_headers_middleware.hpp
+++ b/include/security_headers_middleware.hpp
@@ -36,7 +36,7 @@
 
         res.addHeader(bf::pragma, "no-cache");
         res.addHeader(bf::cache_control, "no-Store,no-Cache");
-        res.addHeader("X-Content-Security-Policy", "default-src 'self'");
+        res.addHeader("Content-Security-Policy", "default-src 'self'");
         res.addHeader("X-XSS-Protection", "1; "
                                           "mode=block");
         res.addHeader("X-Content-Type-Options", "nosniff");