--- a/src/aconnect.cc
+++ b/src/aconnect.cc
@@ -6,6 +6,7 @@
 #include "debug.h"
 #include "portutils.h"
 
+#include <algorithm>
 #include <future>
 
 #include <sys/types.h>
--- a/src/acregistry.cc
+++ b/src/acregistry.cc
@@ -5,6 +5,7 @@
 #include "cleaner.h"
 #include "evabase.h"
 
+#include <algorithm>
 #include <list>
 
 #define IN_ABOUT_ONE_DAY 100000
--- a/src/caddrinfo.cc
+++ b/src/caddrinfo.cc
@@ -1,5 +1,6 @@
 #include "meta.h"
 
+#include <algorithm>
 #include <deque>
 #include <memory>
 #include <list>
--- a/src/header.cc
+++ b/src/header.cc
@@ -10,6 +10,7 @@
 #include "filereader.h"
 #include "httpdate.h"
 
+#include <algorithm>
 #include <map>
 #include <iostream>