diff --git a/drivers/isdn/hardware/avm/t1isa.c b/drivers/isdn/hardware/avm/t1isa.c
index e47c60b0a8ec6b9d80fe16cbfba08a1052e9a582..c925020fe9b7874732383d8605994d30096f3c10 100644
--- a/drivers/isdn/hardware/avm/t1isa.c
+++ b/drivers/isdn/hardware/avm/t1isa.c
@@ -584,6 +584,7 @@ static void __exit t1isa_exit(void)
 {
 	int i;
 
+	unregister_capi_driver(&capi_driver_t1isa);
 	for (i = 0; i < MAX_CARDS; i++) {
 		if (!io[i])
 			break;