diff --git a/src/serial.cc b/src/serial.cc
index cbbc946..92ba9b9 100755
--- a/src/serial.cc
+++ b/src/serial.cc
@@ -1,5 +1,5 @@
 /* Copyright 2012 William Woodall and John Harrison */
-#ifndef _WIN32
+#if !defined(_WIN32) && !defined(__OpenBSD__)
 # include <alloca.h>
 #endif