diff --git a/libraries/AP_HAL/utility/Socket.cpp b/libraries/AP_HAL/utility/Socket.cpp
index 35d368a853..21835199ef 100644
--- a/libraries/AP_HAL/utility/Socket.cpp
+++ b/libraries/AP_HAL/utility/Socket.cpp
@@ -40,6 +40,7 @@
 #include <netinet/tcp.h>
 #include <arpa/inet.h>
 #include <sys/select.h>
+#include <sys/time.h>
 #endif
 
 #include <errno.h>