diff --git a/src/libcharon/bus/bus.h b/src/libcharon/bus/bus.h
index c732b8c92d..2cd04cf97a 100644
--- a/src/libcharon/bus/bus.h
+++ b/src/libcharon/bus/bus.h
@@ -94,6 +94,8 @@ enum alert_t {
 	ALERT_PEER_INIT_UNREACHABLE,
 	/** received IKE message with invalid SPI, argument is message_t* */
 	ALERT_INVALID_IKE_SPI,
+	/** received IKE message with invalid header, argument is message_t* */
+	ALERT_PARSE_ERROR_HEADER,
 };
 
 /**
diff --git a/src/libcharon/network/receiver.c b/src/libcharon/network/receiver.c
index 2f87a5ecb9..205bee58e0 100644
--- a/src/libcharon/network/receiver.c
+++ b/src/libcharon/network/receiver.c
@@ -488,6 +488,7 @@ static job_requeue_t receive_packets(private_receiver_t *this)
 	{
 		DBG1(DBG_NET, "received invalid IKE header from %H - ignored",
 			 packet->get_source(packet));
+		charon->bus->alert(charon->bus, ALERT_PARSE_ERROR_HEADER, message);
 		message->destroy(message);
 		return JOB_REQUEUE_DIRECT;
 	}