diff --git a/experiments/dsv4_h200_sglang_tp_dp_matrix/run_bench.sh b/experiments/dsv4_h200_sglang_tp_dp_matrix/run_bench.sh
index 3f3bb3f..619d25d 100755
--- a/experiments/dsv4_h200_sglang_tp_dp_matrix/run_bench.sh
+++ b/experiments/dsv4_h200_sglang_tp_dp_matrix/run_bench.sh
@@ -12,6 +12,9 @@ source "${SCRIPT_DIR}/../../scripts/common/platform.sh"
 # shellcheck source=/dev/null
 source "${SCRIPT_DIR}/config.env"
 
+# Export variables used inside functions that are called via bash -c subshells.
+export DATASET_PATH
+
 RUN_ID="${RUN_ID:-$(date '+%Y%m%d-%H%M%S')}"
 RESULT_BASE="${SCRIPT_DIR}/results"
 MATRIX_FILE="${MATRIX_FILE:-${SCRIPT_DIR}/matrix.json}"