diff --git a/hw/rtc/m48t59-isa.c b/hw/rtc/m48t59-isa.c
index 6e9723fdf1..b642b82680 100644
--- a/hw/rtc/m48t59-isa.c
+++ b/hw/rtc/m48t59-isa.c
@@ -161,7 +161,7 @@ static void m48t59_isa_register_types(void)
     for (i = 0; i < ARRAY_SIZE(m48txx_isa_info); i++) {
         isa_type_info.name = m48txx_isa_info[i].bus_name;
         isa_type_info.class_data = &m48txx_isa_info[i];
-        type_register(&isa_type_info);
+        type_register_static(&isa_type_info);
     }
 }
 
diff --git a/hw/rtc/m48t59.c b/hw/rtc/m48t59.c
index 48846d8df4..90299ea56f 100644
--- a/hw/rtc/m48t59.c
+++ b/hw/rtc/m48t59.c
@@ -679,7 +679,7 @@ static void m48t59_register_types(void)
     for (i = 0; i < ARRAY_SIZE(m48txx_sysbus_info); i++) {
         sysbus_type_info.name = m48txx_sysbus_info[i].bus_name;
         sysbus_type_info.class_data = &m48txx_sysbus_info[i];
-        type_register(&sysbus_type_info);
+        type_register_static(&sysbus_type_info);
     }
 }