diff --git a/src/serial.cc b/src/serial.cc
index ec7d7c3..250bbd7 100755
--- a/src/serial.cc
+++ b/src/serial.cc
@@ -1,4 +1,6 @@
 /* Copyright 2012 William Woodall and John Harrison */
+#include <algorithm>
+
 #if !defined(_WIN32) && !defined(__OpenBSD__)
 # include <alloca.h>
 #endif