diff --git a/src/bankd/bankd_main.c b/src/bankd/bankd_main.c
index 94227e3..09a9e1d 100644
--- a/src/bankd/bankd_main.c
+++ b/src/bankd/bankd_main.c
@@ -411,6 +411,8 @@ static void handle_sig_mapdel(int sig)
 {
 	LOGW(g_worker, "SIGMAPDEL received: Main thread informs us our map is gone\n");
 	OSMO_ASSERT(sig == SIGMAPDEL);
+	g_worker->slot.bank_id = 0xffff;
+	g_worker->slot.slot_nr = 0xffff;
 	worker_set_state(g_worker, BW_ST_CONN_CLIENT_UNMAPPED);
 }
 
@@ -852,6 +854,9 @@ static void *worker_main(void *arg)
 	/* push cleanup helper */
 	pthread_cleanup_push(&worker_cleanup, g_worker);
 
+	g_worker->slot.bank_id = 0xffff;
+	g_worker->slot.slot_nr = 0xffff;
+
 	/* we continuously perform the same loop here, recycling the worker thread
 	 * once the client connection is gone or we have some trouble with the card/reader */
 	while (1) {