diff --git a/tests/bsim/bluetooth/ll/bis/tests_scripts/broadcast_iso_ll_interface.sh b/tests/bsim/bluetooth/ll/bis/tests_scripts/broadcast_iso_ll_interface.sh
index da4b6726c70..f3061e88348 100755
--- a/tests/bsim/bluetooth/ll/bis/tests_scripts/broadcast_iso_ll_interface.sh
+++ b/tests/bsim/bluetooth/ll/bis/tests_scripts/broadcast_iso_ll_interface.sh
@@ -12,10 +12,10 @@ verbosity_level=2
 cd ${BSIM_OUT_PATH}/bin
 
 Execute ./bs_${BOARD_TS}_tests_bsim_bluetooth_ll_bis_prj_conf_overlay-ll_interface_conf \
-  -v=${verbosity_level} -s=${simulation_id} -d=0 -testid=receive
+  -v=${verbosity_level} -s=${simulation_id} -RealEncryption=1 -d=0 -testid=receive
 
 Execute ./bs_${BOARD_TS}_tests_bsim_bluetooth_ll_bis_prj_conf_overlay-ll_interface_conf \
-  -v=${verbosity_level} -s=${simulation_id} -d=1 -testid=broadcast
+  -v=${verbosity_level} -s=${simulation_id} -RealEncryption=1 -d=1 -testid=broadcast
 
 Execute ./bs_2G4_phy_v1 -v=${verbosity_level} -s=${simulation_id} \
   -D=2 -sim_length=30e6 $@