diff --git a/bsc/BSC_Tests.ttcn b/bsc/BSC_Tests.ttcn
index 485411b..f0117ed 100644
--- a/bsc/BSC_Tests.ttcn
+++ b/bsc/BSC_Tests.ttcn
@@ -104,7 +104,7 @@
 	/*Configure T(tiar) over VTY, seconds */
 	var integer g_bsc_sccp_timer_iar := 15 * 60;
 
-	/* global test case guard timer */
+	/* global test case guard timer (actual timeout value is set in f_init()) */
 	timer T_guard := 30.0;
 
 }
@@ -384,7 +384,7 @@
  * \param nr_msc Number of virtual MSCs to bring up to connect to osmo-bsc.
  */
 function f_init(integer nr_bts := NUM_BTS, boolean handler_mode := false, boolean allow_osmux := false,
-		integer nr_msc := 1) runs on test_CT {
+		integer nr_msc := 1, float guard_timeout := 30.0) runs on test_CT {
 	var integer bssap_idx;
 	var integer i;
 
@@ -393,7 +393,7 @@
 	}
 	g_initialized := true;
 
-	T_guard.start;
+	T_guard.start(guard_timeout);
 	activate(as_Tguard());
 
 	f_init_vty("VirtMSC");