diff --git a/library/GSM_RR_Types.ttcn b/library/GSM_RR_Types.ttcn
index 2625a1f..4d1efd7 100644
--- a/library/GSM_RR_Types.ttcn
+++ b/library/GSM_RR_Types.ttcn
@@ -695,7 +695,7 @@
 					dtx_used := '0'B,
 					rxlev_full_srv_cell := rxl_f,
 					threeg_ba_used := '0'B,
-					meas_valid := bool2bit(valid),
+					meas_valid := bool2bit(not valid),
 					rxlev_sub_srv_cell := rxl_s,
 					si23_ba_used := '0'B,
 					rxqual_full_srv_cell := rxq_f,