diff --git a/src/gsm/gsm0808.c b/src/gsm/gsm0808.c
index d115888..6ba6ef2 100644
--- a/src/gsm/gsm0808.c
+++ b/src/gsm/gsm0808.c
@@ -2478,6 +2478,7 @@
 	{ GSM0808_SCT_HR3, "HR3" },
 	{ GSM0808_SCT_HR4, "HR4" },
 	{ GSM0808_SCT_HR6, "HR6" },
+	{ GSM0808_SCT_EXT, "Codec Extension" },
 	{ GSM0808_SCT_CSD, "CSD" },
 	{ 0, NULL }
 };
diff --git a/src/gsm/gsm0808_utils.c b/src/gsm/gsm0808_utils.c
index b8e1ff0..778630d 100644
--- a/src/gsm/gsm0808_utils.c
+++ b/src/gsm/gsm0808_utils.c
@@ -255,7 +255,7 @@
 		header |= (1 << 4);
 
 	if (type_extended) {
-		header |= 0x0f;
+		header |= GSM0808_SCT_EXT;
 		msgb_put_u8(msg, header);
 		msgb_put_u8(msg, sc->type);
 	} else {
@@ -347,7 +347,7 @@
 
 	/* An extended codec type needs at least two fields,
 	 * bail if the input data length is not sufficient. */
-	if ((header & 0x0F) == 0x0F && len < 2)
+	if ((header & 0x0F) == GSM0808_SCT_EXT && len < 2)
 		return -EINVAL;
 
 	elem++;
@@ -362,7 +362,7 @@
 	if (header & (1 << 4))
 		sc->tf = true;
 
-	if ((header & 0x0F) != 0x0F) {
+	if ((header & 0x0F) != GSM0808_SCT_EXT) {
 		sc->type = (header & 0x0F);
 	} else {
 		sc->type = *elem;