diff --git a/ci-scripts/conf_files/gnb.sa.band254.u0.25prb.rfsim.ntn-leo.conf b/ci-scripts/conf_files/gnb.sa.band254.u0.25prb.rfsim.ntn-leo.conf
index d08d900098..59438e8800 100644
--- a/ci-scripts/conf_files/gnb.sa.band254.u0.25prb.rfsim.ntn-leo.conf
+++ b/ci-scripts/conf_files/gnb.sa.band254.u0.25prb.rfsim.ntn-leo.conf
@@ -150,6 +150,8 @@ gNBs =
 
   #ext2
     #ntn_Config_r17
+      # This can be of values {s5, s10, s15, s20, s25, s30, s35, s40, s45, s50, s55, s60, s120, s180, s240, s900}
+      ntn-UlSyncValidityDuration-r17                                = 5;
       cellSpecificKoffset_r17                                       = 40;
       ta-Common-r17                                                 = 4627000; # 18.84 ms
       ta-CommonDrift-r17                                            = -230000; # -46 µs/s