diff --git a/lib/connect.c b/lib/connect.c
index 1ba87099f..0b404aed7 100644
--- a/lib/connect.c
+++ b/lib/connect.c
@@ -509,6 +509,7 @@ static bool trynextip(struct connectdata *conn,
 
   /* first close the failed socket */
   sclose(conn->sock[sockindex]);
+  conn->sock[sockindex] = CURL_SOCKET_BAD;
 
   /* try the next address */
   ai = conn->ip_addr->ai_next;