diff --git a/src/serial.cc b/src/serial.cc
index b236baf..b817a77 100644
--- a/src/serial.cc
+++ b/src/serial.cc
@@ -1,4 +1,5 @@
 /* Copyright 2012 William Woodall and John Harrison */
+#include <alloca.h>
 
 #include "serial/serial.h"