diff --git a/src/serial.cc b/src/serial.cc
index e188678..cbbc946 100644
--- a/src/serial.cc
+++ b/src/serial.cc
@@ -1,5 +1,7 @@
 /* Copyright 2012 William Woodall and John Harrison */
-//#include <alloca.h>
+#ifndef _WIN32
+# include <alloca.h>
+#endif
 
 #include "serial/serial.h"