diff --git a/btpd/net.c b/btpd/net.c
index 0c64489..72071e7 100644
--- a/btpd/net.c
+++ b/btpd/net.c
@@ -3,6 +3,10 @@
 #include <sys/uio.h>
 #include <netdb.h>
 
+#ifndef IOV_MAX
+#define IOV_MAX 1024
+#endif
+
 static unsigned long m_bw_bytes_in;
 static unsigned long m_bw_bytes_out;