diff --git a/sim_card.c b/sim_card.c
index 1febce86..ecde0b88 100644
--- a/sim_card.c
+++ b/sim_card.c
@@ -1424,7 +1424,7 @@ return SCPE_OK;
 t_stat sim_card_test (DEVICE *dptr)
 {
 t_stat stat = SCPE_OK;
-#if defined(USE_SIM_CARD) && defined(SIM_CARD_API)
+#if defined(USE_SIM_CARD) && defined(SIM_CARD_API) && (SIM_MAJOR > 3)
 char cmd[CBUFSIZE];
 char saved_filename[4*CBUFSIZE];
 uint16 card_image[80];
diff --git a/sim_card.h b/sim_card.h
index 7050716e..066c59e6 100644
--- a/sim_card.h
+++ b/sim_card.h
@@ -139,9 +139,9 @@ t_stat   sim_card_show_fmt (FILE *st, UNIT *uptr, int32 val, CONST void *desc);
 t_stat   sim_card_attach_help(FILE *st, DEVICE *dptr, UNIT *uptr, int32 flag, const char *cptr);
 
 /* Translation tables */
-extern CONST char      sim_six_to_ascii[64];        /* Map BCD to ASCII */
-extern CONST char      sim_ascii_to_six[128];       /* Map 7 bit ASCII to BCD */
-extern CONST uint8     sim_parity_table[64];        /* 64 entry odd parity table */
+extern const char      sim_six_to_ascii[64];        /* Map BCD to ASCII */
+extern const char      sim_ascii_to_six[128];       /* Map 7 bit ASCII to BCD */
+extern const uint8     sim_parity_table[64];        /* 64 entry odd parity table */
 
 /* Unit test routine */
 extern t_stat sim_card_test (DEVICE *dptr);