diff --git a/openair2/GNB_APP/gnb_config.c b/openair2/GNB_APP/gnb_config.c
index c673293e92..0f86ab31e1 100644
--- a/openair2/GNB_APP/gnb_config.c
+++ b/openair2/GNB_APP/gnb_config.c
@@ -379,7 +379,7 @@ void fill_scc_sim(NR_ServingCellConfigCommon_t *scc, uint64_t *ssb_bitmap, int N
   initialUplinkBWP->genericParameters.subcarrierSpacing = mu_ul;
 
   struct NR_SetupRelease_RACH_ConfigCommon *rach_ConfigCommon = initialUplinkBWP->rach_ConfigCommon;
-  rach_ConfigCommon->choice.setup->rach_ConfigGeneric.prach_ConfigurationIndex = 98;
+  rach_ConfigCommon->choice.setup->rach_ConfigGeneric.prach_ConfigurationIndex = mu_ul == 3 ? 52 : 98;
   rach_ConfigCommon->choice.setup->rach_ConfigGeneric.msg1_FDM = NR_RACH_ConfigGeneric__msg1_FDM_one;
   rach_ConfigCommon->choice.setup->rach_ConfigGeneric.msg1_FrequencyStart = 0;
   rach_ConfigCommon->choice.setup->rach_ConfigGeneric.zeroCorrelationZoneConfig = 13;