diff --git a/library/net.c b/library/net.c
index 9724c07d7..e30aebba5 100644
--- a/library/net.c
+++ b/library/net.c
@@ -63,6 +63,8 @@ static int wsa_init_done = 0;
 #include <sys/endian.h>
 #elif defined(__APPLE__)
 #include <machine/endian.h>
+#elif defined(sun)
+#include <sys/isa_defs.h>
 #else
 #include <endian.h>
 #endif