diff --git a/targets/PROJECTS/GENERIC-NR-5GC/CONF/gnb-pnf.band78.rfsim.conf b/targets/PROJECTS/GENERIC-NR-5GC/CONF/gnb-pnf.band78.rfsim.conf
index 887ff6eced..08691c3b62 100644
--- a/targets/PROJECTS/GENERIC-NR-5GC/CONF/gnb-pnf.band78.rfsim.conf
+++ b/targets/PROJECTS/GENERIC-NR-5GC/CONF/gnb-pnf.band78.rfsim.conf
@@ -22,6 +22,7 @@ RUs = ({
   att_tx     = 0
   att_rx     = 0;
   bands      = [78];
+  sl_ahead = 2;
   max_pdschReferenceSignalPower = -27;
   max_rxgain = 125;
 });