diff --git a/src/include/lwip/sockets.h b/src/include/lwip/sockets.h
index eaf71434..d70d36c4 100644
--- a/src/include/lwip/sockets.h
+++ b/src/include/lwip/sockets.h
@@ -49,6 +49,8 @@
 #include "lwip/inet.h"
 #include "lwip/errno.h"
 
+#include <string.h>
+
 #ifdef __cplusplus
 extern "C" {
 #endif