diff --git a/src/codec/gsm610.c b/src/codec/gsm610.c
index 47faea2..165484d 100644
--- a/src/codec/gsm610.c
+++ b/src/codec/gsm610.c
@@ -306,16 +306,16 @@
 bool osmo_fr_check_sid(uint8_t *rtp_payload, size_t payload_len)
 {
 	struct bitvec bv;
-	uint16_t i, z_bits[] = { 59, 60, 62, 63, 65, 66, 68, 69, 71, 72, 74, 75,
-				 77, 78, 80, 81, 83, 84, 86, 87, 89, 90, 92, 93,
-				 95, 96, 115, 116, 118, 119, 121, 122, 124, 125,
-				 127, 128, 130, 131, 133, 134, 136, 137, 139,
-				 140, 142, 143, 145, 146, 148, 149, 151, 152,
-				 171, 172, 174, 175, 177, 178, 180, 181, 183,
-				 184, 186, 187, 189, 190, 192, 193, 195, 196,
-				 198, 199, 201, 202, 204, 205, 207, 208, 227,
-				 228, 230, 231, 233, 234, 236, 237, 239, 242,
-				 245, 248, 251, 254, 257, 260, 263 };
+	uint16_t i, z_bits[] = { 57, 58, 60, 61, 63, 64, 66, 67, 69, 70, 72, 73,
+				 75, 76, 78, 79, 81, 82, 84, 85, 87, 88, 90, 91,
+				 93, 94, 113, 114, 116, 117, 119, 120, 122, 123,
+				 125, 126, 128, 129, 131, 132, 134, 135, 137,
+				 138, 140, 141, 143, 144, 146, 147, 149, 150,
+				 169, 170, 172, 173, 175, 176, 178, 179, 181,
+				 182, 184, 185, 187, 188, 190, 191, 193, 194,
+				 196, 197, 199, 200, 202, 203, 205, 206, 225,
+				 226, 228, 229, 231, 232, 234, 235, 237, 240,
+				 243, 246, 249, 252, 255, 258, 261 };
 
 	/* signature does not match Full Rate SID */
 	if ((rtp_payload[0] >> 4) != 0xD)