diff --git a/tests/bsim/run_parallel.sh b/tests/bsim/run_parallel.sh
index 80e7451..cb9a3d4 100755
--- a/tests/bsim/run_parallel.sh
+++ b/tests/bsim/run_parallel.sh
@@ -63,6 +63,8 @@
 
 all_cases_a=( $all_cases )
 n_cases=$((${#all_cases_a[@]}))
+
+mkdir -p $(dirname ${RESULTS_FILE})
 touch ${RESULTS_FILE}
 echo "Attempting to run ${n_cases} cases (logging to \
  `realpath ${RESULTS_FILE}`)"