diff --git a/openbsc/tests/gbproxy/Makefile.am b/openbsc/tests/gbproxy/Makefile.am
index 409d791..5f5e582 100644
--- a/openbsc/tests/gbproxy/Makefile.am
+++ b/openbsc/tests/gbproxy/Makefile.am
@@ -9,6 +9,9 @@
 gbproxy_test_SOURCES = gbproxy_test.c
 gbproxy_test_LDADD = \
 			$(top_builddir)/src/gprs/gb_proxy.o \
+			$(top_builddir)/src/gprs/gb_proxy_patch.o \
+			$(top_builddir)/src/gprs/gb_proxy_tlli.o \
+			$(top_builddir)/src/gprs/gprs_gb_parse.o \
 			$(top_builddir)/src/gprs/gprs_llc_parse.o \
 			$(top_builddir)/src/gprs/crc24.o \
 			$(top_builddir)/src/gprs/gprs_utils.o \