diff --git a/sim_defs.h b/sim_defs.h
index af1f09ed..b3968961 100644
--- a/sim_defs.h
+++ b/sim_defs.h
@@ -541,8 +541,9 @@ struct DEVICE {
 #define DEV_DISK        (1 << DEV_V_TYPE)               /* sim_disk Attach */
 #define DEV_TAPE        (2 << DEV_V_TYPE)               /* sim_tape Attach */
 #define DEV_MUX         (3 << DEV_V_TYPE)               /* sim_tmxr Attach */
-#define DEV_ETHER       (4 << DEV_V_TYPE)               /* Ethernet Device */
-#define DEV_DISPLAY     (5 << DEV_V_TYPE)               /* Display Device */
+#define DEV_CARD        (4 << DEV_V_TYPE)               /* sim_card Attach */
+#define DEV_ETHER       (5 << DEV_V_TYPE)               /* Ethernet Device */
+#define DEV_DISPLAY     (6 << DEV_V_TYPE)               /* Display Device */
 #define DEV_TYPE(dptr)  ((dptr)->flags & DEV_TYPEMASK)
 
 #define DEV_UFMASK_31   (((1u << DEV_V_RSV) - 1) & ~((1u << DEV_V_UF_31) - 1))