diff --git a/sim_card.c b/sim_card.c
index aebc759..128cca2 100644
--- a/sim_card.c
+++ b/sim_card.c
@@ -709,7 +709,7 @@ sim_read_card(UNIT * uptr)
         sim_debug(DEBUG_CARD, dptr, "cbn\n");
         /* Check if first character is a tape mark */
         if (((uint8)data->cbuff[0]) == 0217 && 
-                   (size == 1 || (((uint8)data->cbuff[0]) & 0200) != 0)) {
+                   (size == 1 || (((uint8)data->cbuff[1]) & 0200) != 0)) {
             i = 1;
             r = SCPE_EOF;
             break;
@@ -751,7 +751,7 @@ sim_read_card(UNIT * uptr)
         sim_debug(DEBUG_CARD, dptr, "bcd [");
         /* Check if first character is a tape mark */
         if (((uint8)data->cbuff[0]) == 0217 && 
-                   (size == 1 || (((uint8)data->cbuff[0]) & 0200) != 0)) {
+                   (size == 1 || (((uint8)data->cbuff[1]) & 0200) != 0)) {
             i = 1;
             r = SCPE_EOF;
             break;