diff --git a/lib/libavb/avb_sysdeps_posix.c b/lib/libavb/avb_sysdeps_posix.c
index 4ccf41e..0bb0cc1 100644
--- a/lib/libavb/avb_sysdeps_posix.c
+++ b/lib/libavb/avb_sysdeps_posix.c
@@ -3,6 +3,7 @@
  * Copyright (C) 2016 The Android Open Source Project
  */
 
+#include <hang.h>
 #include <stdarg.h>
 #include <stdlib.h>