diff --git a/src/libmsc/Makefile.am b/src/libmsc/Makefile.am
index 9f246b3..c9b8bb4 100644
--- a/src/libmsc/Makefile.am
+++ b/src/libmsc/Makefile.am
@@ -35,8 +35,6 @@
 	gsm_04_14.c \
 	gsm_04_80.c \
 	gsm_subscriber.c \
-	iucs.c \
-	iucs_ranap.c \
 	mncc.c \
 	mncc_builtin.c \
 	mncc_sock.c \
@@ -52,7 +50,12 @@
 	meas_feed.c \
 	subscr_conn.c \
 	$(NULL)
-if !BUILD_IU
+if BUILD_IU
+libmsc_a_SOURCES += \
+	iucs.c \
+	iucs_ranap.c \
+	$(NULL)
+else
 libmsc_a_SOURCES += \
 	iu_dummy.c \
 	$(NULL)