diff --git a/openbsc/include/osmocom/gprs/gprs_bssgp.h b/openbsc/include/osmocom/gprs/gprs_bssgp.h
index 9970a51..25c902c 100644
--- a/openbsc/include/osmocom/gprs/gprs_bssgp.h
+++ b/openbsc/include/osmocom/gprs/gprs_bssgp.h
@@ -249,5 +249,6 @@
 
 /* gprs_bssgp_vty.c */
 int gprs_bssgp_vty_init(void);
+void gprs_bssgp_set_log_ss(int ss);
 
 #endif /* _GPRS_BSSGP_H */