diff --git a/openbsc/tests/sgsn/Makefile.am b/openbsc/tests/sgsn/Makefile.am
index d148c48..cf88101 100644
--- a/openbsc/tests/sgsn/Makefile.am
+++ b/openbsc/tests/sgsn/Makefile.am
@@ -56,7 +56,8 @@
 	$(top_builddir)/src/gprs/gprs_gb_parse.o \
 	$(top_builddir)/src/gprs/oap.o \
 	$(top_builddir)/src/gprs/oap_messages.o \
-	$(top_builddir)/src/gprs/gprs_llc_xid.o \
+        $(top_builddir)/src/gprs/gprs_llc_xid.o \
+	$(top_builddir)/src/gprs/gprs_sndcp_xid.o \
 	$(top_builddir)/src/libcommon/libcommon.a \
 	$(LIBOSMOABIS_LIBS) \
 	$(LIBOSMOCORE_LIBS) \
@@ -66,7 +67,9 @@
 	$(LIBCRYPTO_LIBS) \
 	$(LIBGTP_LIBS) \
 	-lrt \
+	-lm \
 	$(NULL)
+
 if BUILD_IU
 sgsn_test_LDADD += \
 	$(top_builddir)/src/libiu/libiu.a \