diff --git a/openbsc/include/osmocom/gprs/gprs_ns.h b/openbsc/include/osmocom/gprs/gprs_ns.h
index ab4bd4e..a77515d 100644
--- a/openbsc/include/osmocom/gprs/gprs_ns.h
+++ b/openbsc/include/osmocom/gprs/gprs_ns.h
@@ -258,6 +258,8 @@
 	uint8_t cause;
 };
 
+void gprs_ns_set_log_ss(int ss);
+
 /*! }@ */
 
 #endif