diff --git a/io/iob_send.c b/io/iob_send.c
index dd6b060..2443dfb 100644
--- a/io/iob_send.c
+++ b/io/iob_send.c
@@ -4,7 +4,8 @@
 #include <errno.h>
 #include <netinet/in.h>
 #include <netinet/tcp.h>
-#if defined(__linux__) || defined(__FreeBSD__)
+#include <stdlib.h>
+#if defined(__linux__)
 #include <alloca.h>
 #endif