diff --git a/include/sys/random.h b/include/sys/random.h
index 4ee7bf2c..59e40ab8 100644
--- a/include/sys/random.h
+++ b/include/sys/random.h
@@ -10,6 +10,7 @@ extern "C" {
 
 #define GRND_NONBLOCK	0x0001
 #define GRND_RANDOM	0x0002
+#define GRND_INSECURE	0x0004
 
 ssize_t getrandom(void *, size_t, unsigned);