diff --git a/su_socket.c b/su_socket.c
index aaf3951f0..742acce59 100644
--- a/su_socket.c
+++ b/su_socket.c
@@ -7,6 +7,7 @@
 #include <unistd.h>
 #include <fcntl.h>
 #include <errno.h>
+#include <endian.h>
 #include <sys/types.h>
 #include <sys/socket.h>
 #include <sys/un.h>