diff --git a/include/msgpack/vrefbuffer.h b/include/msgpack/vrefbuffer.h
index 574c3cb9..ab51aefa 100644
--- a/include/msgpack/vrefbuffer.h
+++ b/include/msgpack/vrefbuffer.h
@@ -13,7 +13,7 @@
 #include "zone.h"
 #include <stdlib.h>
 
-#if defined(unix) || defined(__unix) || defined(__APPLE__) || defined(__OpenBSD__) || defined(__NetBSD__) || defined(__QNX__) || defined(__QNXTO__) || defined(__HAIKU__)
+#if defined(unix) || defined(__unix) || defined(__linux__) || defined(__APPLE__) || defined(__OpenBSD__) || defined(__NetBSD__) || defined(__QNX__) || defined(__QNXTO__) || defined(__HAIKU__)
 #include <sys/uio.h>
 #else
 struct iovec {