diff --git a/proto/bgp/bgp.c b/proto/bgp/bgp.c
index f549b0ed..11f33b14 100644
--- a/proto/bgp/bgp.c
+++ b/proto/bgp/bgp.c
@@ -813,7 +813,13 @@ bgp_incoming_connection(sock *sk, int dummy UNUSED)
       return 0;
     }
 
-  /* We are in proper state and there is no other incoming connection */
+  /*
+   * BIRD should keep multiple incoming connections in OpenSent state (for
+   * details RFC 4271 8.2.1 par 3), but it keeps just one. Duplicate incoming
+   * connections are rejected istead. The exception is the case where an
+   * incoming connection triggers a graceful restart.
+   */
+
   acc = (p->p.proto_state == PS_START || p->p.proto_state == PS_UP) &&
     (p->start_state >= BSS_CONNECT) && (!p->incoming_conn.sk);
 
@@ -823,6 +829,10 @@ bgp_incoming_connection(sock *sk, int dummy UNUSED)
       bgp_handle_graceful_restart(p);
       bgp_conn_enter_idle_state(p->conn);
       acc = 1;
+
+      /* There might be separate incoming connection in OpenSent state */
+      if (p->incoming_conn.state > BS_ACTIVE)
+	bgp_close_conn(&p->incoming_conn);
     }
 
   BGP_TRACE(D_EVENTS, "Incoming connection from %I%J (port %d) %s",