diff --git a/include/osmocom/gsm/protocol/gsm_04_08.h b/include/osmocom/gsm/protocol/gsm_04_08.h
index 6a5fb3b..68ba650 100644
--- a/include/osmocom/gsm/protocol/gsm_04_08.h
+++ b/include/osmocom/gsm/protocol/gsm_04_08.h
@@ -977,7 +977,6 @@
 #define GSM48_PDISC_EXTEND	0x0e
 #define GSM48_PDISC_TEST	0x0f	/* as per 11.10, 04.14 */
 #define GSM48_PDISC_MASK	0x0f
-#define GSM48_PDISC_USSD	0x11
 
 extern const struct value_string gsm48_pdisc_names[];
 static inline const char *gsm48_pdisc_name(uint8_t val)
diff --git a/src/gsm/gsm48.c b/src/gsm/gsm48.c
index 468b2a9..0bce1ed 100644
--- a/src/gsm/gsm48.c
+++ b/src/gsm/gsm48.c
@@ -775,7 +775,6 @@
 	{ GSM48_PDISC_LOC,		"LCS" },
 	{ GSM48_PDISC_EXTEND,		"EXTD" },
 	{ GSM48_PDISC_MASK,		"MASK" },
-	{ GSM48_PDISC_USSD,		"USSD" },
 	{ 0, NULL }
 };