diff --git a/scripts/launch_local_testnet.sh b/scripts/launch_local_testnet.sh
index f5d88a014..0bbd4e96d 100755
--- a/scripts/launch_local_testnet.sh
+++ b/scripts/launch_local_testnet.sh
@@ -1003,6 +1003,7 @@ for NUM_NODE in $(seq 0 $(( NUM_NODES - 1 ))); do
     --keymanager-token-file="${DATA_DIR}/keymanager-token" \
     --rest-port="$(( BASE_REST_PORT + NUM_NODE ))" \
     --metrics-port="$(( BASE_METRICS_PORT + NUM_NODE ))" \
+    --sync-light-client=on \
     ${EXTRA_ARGS} \
     &> "${DATA_DIR}/log${NUM_NODE}.txt" &