diff --git a/src/libmsc/Makefile.am b/src/libmsc/Makefile.am
index 3173da5..ad8deec 100644
--- a/src/libmsc/Makefile.am
+++ b/src/libmsc/Makefile.am
@@ -35,6 +35,7 @@
 	gsm_04_11.c \
 	gsm_04_14.c \
 	gsm_04_80.c \
+	gsm_09_11.c \
 	gsm_subscriber.c \
 	mncc.c \
 	mncc_builtin.c \
@@ -44,7 +45,6 @@
 	rrlp.c \
 	silent_call.c \
 	sms_queue.c \
-	ussd.c \
 	transaction.c \
 	osmo_msc.c \
 	ctrl_commands.c \