diff --git a/openbsc/tests/sgsn/Makefile.am b/openbsc/tests/sgsn/Makefile.am
index e3cec50..b6036c7 100644
--- a/openbsc/tests/sgsn/Makefile.am
+++ b/openbsc/tests/sgsn/Makefile.am
@@ -7,6 +7,7 @@
 
 sgsn_test_SOURCES = sgsn_test.c
 sgsn_test_LDFLAGS = \
+	-Wl,--wrap=RAND_bytes \
 	-Wl,--wrap=sgsn_update_subscriber_data \
 	-Wl,--wrap=gprs_subscr_request_update_location \
 	-Wl,--wrap=gprs_subscr_request_auth_info \