diff --git a/test/simulation/139-nts b/test/simulation/139-nts
index 773f885..5bb2f44 100755
--- a/test/simulation/139-nts
+++ b/test/simulation/139-nts
@@ -64,8 +64,11 @@ if check_config_h 'FEAT_IPV6 1'; then
 	check_source_selection || test_fail
 	check_sync || test_fail
 
+	check_file_messages "20.*:123:1.* 111 111 1111" 75 80 measurements.log || test_fail
+	check_file_messages "20.*:123:1.* 111 001 0000" 37 39 measurements.log || test_fail
 	check_file_messages "	2	1	.*	4460	" 260 300 log.packets || test_fail
 	check_file_messages "." 6 6 ntskeys || test_fail
+	rm -f tmp/measurements.log
 
 	ip_family=$default_ip_family
 fi