diff --git a/src/shrpx_memcached_connection.cc b/src/shrpx_memcached_connection.cc
index a1b7eaec..c5776d34 100644
--- a/src/shrpx_memcached_connection.cc
+++ b/src/shrpx_memcached_connection.cc
@@ -24,6 +24,8 @@
  */
 #include "shrpx_memcached_connection.h"
 
+#include <sys/uio.h>
+
 #include "shrpx_memcached_request.h"
 #include "shrpx_memcached_result.h"
 #include "shrpx_config.h"