diff --git a/dtls/tutorial-udp-dtls.md b/dtls/tutorial-udp-dtls.md
index b47d22fc..30f17f55 100644
--- a/dtls/tutorial-udp-dtls.md
+++ b/dtls/tutorial-udp-dtls.md
@@ -78,7 +78,7 @@ There are five initial steps to creating a UDP/IP Server.
 
     Figure 1.3 Setting Protocol
     
-   `#include <sys/socket.h>
+   `#include <sys/socket.h>`
     …
     int sockfd;