diff --git a/src/include/lwip/apps/FILES b/src/include/lwip/apps/FILES
index b3f1f0f6..adfc0f33 100644
--- a/src/include/lwip/apps/FILES
+++ b/src/include/lwip/apps/FILES
@@ -1,2 +1,2 @@
 This directory contains application headers.
-Every application shall provide one api file APP.h and one options file APP_opts.h
+Every application shall provide one api file APP.h and optionally one options file APP_opts.h
diff --git a/src/include/lwip/apps/sntp.h b/src/include/lwip/apps/sntp.h
index 19dbfcea..68c47a81 100644
--- a/src/include/lwip/apps/sntp.h
+++ b/src/include/lwip/apps/sntp.h
@@ -29,8 +29,8 @@
  * Author: Frédéric Bernon, Simon Goldschmidt
  *
  */
-#ifndef LWIP_SNTP_H
-#define LWIP_SNTP_H
+#ifndef LWIP_HDR_SNTP_H
+#define LWIP_HDR_SNTP_H
 
 #include "lwip/apps/sntp_opts.h"
 #include "lwip/ip_addr.h"
@@ -66,4 +66,4 @@ void sntp_servermode_dhcp(int set_servers_from_dhcp);
 }
 #endif
 
-#endif /* LWIP_SNTP_H */
+#endif /* LWIP_HDR_SNTP_H */