diff --git a/sim_card.c b/sim_card.c
index fc75797..fcb2af2 100644
--- a/sim_card.c
+++ b/sim_card.c
@@ -791,7 +791,7 @@ _sim_parse_card(UNIT *uptr, DEVICE *dptr, struct _card_buffer *buf, uint16 (*ima
         for (col = i = 0; i < 160;) {
             temp |= (uint16)(buf->buffer[i] & 0xff);
             (*image)[col] = (buf->buffer[i++] >> 4) & 0xF;
-            (*image)[col++] |= ((uint16)buf->buffer[i++] & 0xf) << 4;
+            (*image)[col++] |= ((uint16)buf->buffer[i++] & 0xff) << 4;
         }
         /* Check if format error */
         if (temp & 0xF)