diff --git a/tests/sgsn/Makefile.am b/tests/sgsn/Makefile.am
index abcc357..0eb2100 100644
--- a/tests/sgsn/Makefile.am
+++ b/tests/sgsn/Makefile.am
@@ -45,6 +45,7 @@
 	$(top_builddir)/src/gprs/gprs_llc.o \
 	$(top_builddir)/src/gprs/crc24.o \
 	$(top_builddir)/src/gprs/gprs_sndcp.o \
+	$(top_builddir)/src/gprs/gprs_gmm_attach.o \
 	$(top_builddir)/src/gprs/gprs_gmm.o \
 	$(top_builddir)/src/gprs/gprs_sgsn.o \
 	$(top_builddir)/src/gprs/sgsn_vty.o \