diff --git a/bts/BTS_Tests.ttcn b/bts/BTS_Tests.ttcn
index 1044747..b77a70a 100644
--- a/bts/BTS_Tests.ttcn
+++ b/bts/BTS_Tests.ttcn
@@ -1240,8 +1240,13 @@
 		supp_meas_info := omit
 	};
 	if (l1p.toa256_enabled) {
-		ul_meas.len := 5;
-		ul_meas.supp_meas_info := int2oct(l1p.timing_offset_256syms, 2);
+		ul_meas.len := (3+8);
+		ul_meas.supp_meas_info := {
+			toa256_mean := l1p.timing_offset_256syms,
+			toa256_min := ?,
+			toa256_max := ?,
+			toa256_std_dev := ?
+		}
 	}
 	/* HACK HACK HACK FIXME HACK HACK HACK see https://osmocom.org/issues/2988 */
 	ul_meas.rxlev_f_u := ?;