diff --git a/openbsc/src/rest_octets.c b/openbsc/src/rest_octets.c
index 16996ce..df27cf2 100644
--- a/openbsc/src/rest_octets.c
+++ b/openbsc/src/rest_octets.c
@@ -133,6 +133,7 @@
 			     const struct gsm48_lsa_params *lsa_params)
 {
 	/* FIXME */
+	return -1;
 }
 
 /* Generate SI4 Rest Octets (Chapter 10.5.2.35) */