diff --git a/openbsc/tests/bsc-nat/Makefile.am b/openbsc/tests/bsc-nat/Makefile.am
index f0d21f0..d26bbeb 100644
--- a/openbsc/tests/bsc-nat/Makefile.am
+++ b/openbsc/tests/bsc-nat/Makefile.am
@@ -8,5 +8,6 @@
 bsc_nat_test_SOURCES = bsc_nat_test.c \
 			$(top_srcdir)/src/nat/bsc_filter.c \
 			$(top_srcdir)/src/nat/bsc_sccp.c \
-			$(top_srcdir)/src/nat/bsc_nat_utils.c
+			$(top_srcdir)/src/nat/bsc_nat_utils.c \
+			$(top_srcdir)/src/bssap.c
 bsc_nat_test_LDADD = $(top_builddir)/src/libbsc.a $(top_builddir)/src/libsccp.a $(LIBOSMOCORE_LIBS)