diff --git a/src/algo_dup2.c b/src/algo_dup2.c
index 5c4d3d1..076b108 100644
--- a/src/algo_dup2.c
+++ b/src/algo_dup2.c
@@ -53,9 +53,11 @@ int algo_dup2_on_datagram(struct evt_core_ctx* ctx, struct evt_core_fdinfo* fdin
   bp->ip.ap.str.id = dup2c->emit_id;
   dup2c->emit_id = dup2c->emit_id + 1;
 
+  struct evt_core_cat* cat = evt_core_get_from_cat (ctx, "tcp-write");
+
   for (int i = 0; i < 2; i++) {
     // 1. A whole packet has been read, we will find someone to write it
-    to_fdinfo = evt_core_get_from_url (ctx, url[i]);
+    to_fdinfo = g_array_index(cat->socklist, struct evt_core_fdinfo*, i);
     if (to_fdinfo == NULL) {
       fprintf(stderr, "No fd for URL %s in udp-read.\n", url[i]);
       continue;