diff --git a/bts/BTS_Tests.ttcn b/bts/BTS_Tests.ttcn
index f4a5a48..32269e2 100644
--- a/bts/BTS_Tests.ttcn
+++ b/bts/BTS_Tests.ttcn
@@ -1625,8 +1625,14 @@
 
 testcase TC_si_sched_default() runs on test_CT {
 	f_init();
-	f_rsl_bcch_fill(RSL_SYSTEM_INFO_2, ts_SI2_default);
-	f_rsl_bcch_fill(RSL_SYSTEM_INFO_4, ts_SI4_default);
+	/* 2+3+4 are mandatory and set in f_init() */
+	f_TC_si_sched();
+}
+
+testcase TC_si_sched_1() runs on test_CT {
+	f_init();
+	si_cfg.si1_present := true;
+	f_rsl_bcch_fill_raw(RSL_SYSTEM_INFO_1, '5506198fb38000000000000000000000000000e504002b'O);
 	f_TC_si_sched();
 }
 
@@ -2244,6 +2250,7 @@
 	execute( TC_rsl_mand_ie_error() );
 	execute( TC_rsl_ie_content_error() );
 	execute( TC_si_sched_default() );
+	execute( TC_si_sched_1() );
 	execute( TC_si_sched_2bis() );
 	execute( TC_si_sched_2ter() );
 	execute( TC_si_sched_2ter_2bis() );