diff --git a/thirdparty/tas/hdlc.c b/thirdparty/tas/hdlc.c
index 296c8988..895bad7a 100644
--- a/thirdparty/tas/hdlc.c
+++ b/thirdparty/tas/hdlc.c
@@ -67,6 +67,7 @@ int hdlc_remove_framing_with_crc_check(const uint8_t *src, size_t slen, uint8_t
 	*dlen = 0;
 	if (slen < 4) return -1;
 	if ((src[tlen] != 0x7E) && (src[slen-1] != 0x7C)) return -2;
+	src++;
 	for (ii = 1; ii < slen-1; ii++)
 	{
 		bt = *src++;
@@ -74,6 +75,7 @@ int hdlc_remove_framing_with_crc_check(const uint8_t *src, size_t slen, uint8_t
 		if (bt == 0x7D)
 		{
 			bt = *src++ ^ 0x20;
+			ii++;
 		}
 		dst[tlen++] = bt;
 	}