diff --git a/site_ansto/hardsup/Monitor/sock.c b/site_ansto/hardsup/Monitor/sock.c
index 5f957fc3..e3ce1be7 100644
--- a/site_ansto/hardsup/Monitor/sock.c
+++ b/site_ansto/hardsup/Monitor/sock.c
@@ -422,6 +422,7 @@ void sock_accept(int n)
     fdv[num_fds].device = fdv[n].device;
     fdv[num_fds].line_len = 0;
     fdv[num_fds].state = 0;
+    fdv[num_fds].match = 0;
     fds[num_fds].fd = sock_n;
     fds[num_fds].events = POLLIN;
     ++num_fds;