diff --git a/slirp/socket.c b/slirp/socket.c
index a7ab933..bb639ae 100644
--- a/slirp/socket.c
+++ b/slirp/socket.c
@@ -51,6 +51,7 @@
     so->so_state = SS_NOFDREF;
     so->s = -1;
     so->slirp = slirp;
+    so->pollfds_idx = -1;
   }
   return(so);
 }