diff --git a/openbsc/src/libmsc/Makefile.am b/openbsc/src/libmsc/Makefile.am
index 4a1488d..c29d521 100644
--- a/openbsc/src/libmsc/Makefile.am
+++ b/openbsc/src/libmsc/Makefile.am
@@ -16,5 +16,6 @@
 			ussd.c \
 			vty_interface_layer3.c \
 			transaction.c \
+			smpp_smsc.c smpp_openbsc.c \
 			osmo_msc.c