diff --git a/openbsc/tests/sgsn/Makefile.am b/openbsc/tests/sgsn/Makefile.am
index 4c6ba9f..d432fb1 100644
--- a/openbsc/tests/sgsn/Makefile.am
+++ b/openbsc/tests/sgsn/Makefile.am
@@ -29,6 +29,8 @@
 	$(top_builddir)/src/gprs/gprs_subscriber.o \
 	$(top_builddir)/src/gprs/gsm_04_08_gprs.o \
 	$(top_builddir)/src/gprs/gprs_gb_parse.o \
+	$(top_builddir)/src/gprs/oap.o \
+	$(top_builddir)/src/gprs/oap_messages.o \
 	$(top_builddir)/src/libcommon/libcommon.a \
 	$(LIBOSMOABIS_LIBS) \
 	$(LIBOSMOCORE_LIBS) \