diff --git a/src/unix/sunos.c b/src/unix/sunos.c
index d80631ea..c56b7dc5 100644
--- a/src/unix/sunos.c
+++ b/src/unix/sunos.c
@@ -19,6 +19,7 @@
  */
 
 #include "uv.h"
+#include "internal.h"
 
 #include <stdio.h>
 #include <stdint.h>