diff --git a/lib/atc/Function.cpp b/lib/atc/Function.cpp
index 70f8bbfa41..062cbcb9b2 100644
--- a/lib/atc/Function.cpp
+++ b/lib/atc/Function.cpp
@@ -1,5 +1,11 @@
-#ifndef _WIN32
+#if !defined(_WIN32)
+
+#if defined(__FreeBSD__) || defined(__DragonFly__) || defined(__OpenBSD__) || defined(__NetBSD__)
+#include <cstdlib>
+#else
 #include <alloca.h>
+#endif
+
 #endif
 #include "Function.h"
 #include "ATC_Error.h"