diff --git a/gpio/atsam4s/index.html b/gpio/atsam4s/index.html
index e29d08332fe72919724a0f8cd0b303a767b49a68..64c182bcb5a0e6b2cba456404c5019ff8bc9202a 100644
--- a/gpio/atsam4s/index.html
+++ b/gpio/atsam4s/index.html
@@ -24,7 +24,7 @@ pre code {
 
 <pre>
 <code>
-#include <asf.h>
+#include &ltasf.h&gt
 
 int main (void)
 {