diff --git a/openbsc/tests/gbproxy/Makefile.am b/openbsc/tests/gbproxy/Makefile.am
index 8e88dc4..9c1b2d0 100644
--- a/openbsc/tests/gbproxy/Makefile.am
+++ b/openbsc/tests/gbproxy/Makefile.am
@@ -9,6 +9,8 @@
 gbproxy_test_SOURCES = gbproxy_test.c
 gbproxy_test_LDADD = \
 			$(top_builddir)/src/gprs/gb_proxy.o \
+			$(top_builddir)/src/gprs/gprs_llc_parse.o \
+			$(top_builddir)/src/gprs/crc24.o \
 			$(top_builddir)/src/libcommon/libcommon.a \
 			$(top_builddir)/src/libbsc/libbsc.a \
 			$(top_builddir)/src/libtrau/libtrau.a \