--- a/pcap-linux.c
+++ b/pcap-linux.c
@@ -254,6 +254,8 @@ static const char rcsid[] _U_ =
typedef int socklen_t;
#endif
+#undef IW_MODE_MONITOR
+
#ifndef MSG_TRUNC
/*
* This is being compiled on a system that lacks MSG_TRUNC; define it
