diff --git a/library/net_sockets.c b/library/net_sockets.c
index 58244e5..76b0ecd 100644
--- a/library/net_sockets.c
+++ b/library/net_sockets.c
@@ -47,6 +47,7 @@
 #include "mbedtls/net_sockets.h"
 
 #include <string.h>
+#include "mbedtls/platform_util.h"
 
 #if (defined(_WIN32) || defined(_WIN32_WCE)) && !defined(EFIX64) && \
     !defined(EFI32)