diff --git a/src/memchunk.h b/src/memchunk.h
index 1673a343..0ec40f26 100644
--- a/src/memchunk.h
+++ b/src/memchunk.h
@@ -27,6 +27,7 @@
 
 #include "nghttp2_config.h"
 
+#include <limits.h>
 #include <sys/uio.h>
 
 #include <cassert>
diff --git a/src/shrpx_memcached_connection.cc b/src/shrpx_memcached_connection.cc
index c5776d34..ace5928c 100644
--- a/src/shrpx_memcached_connection.cc
+++ b/src/shrpx_memcached_connection.cc
@@ -24,6 +24,7 @@
  */
 #include "shrpx_memcached_connection.h"
 
+#include <limits.h>
 #include <sys/uio.h>
 
 #include "shrpx_memcached_request.h"