diff --git a/tools/push3-evolution/evolve.sh b/tools/push3-evolution/evolve.sh
index c883aae..b76490c 100755
--- a/tools/push3-evolution/evolve.sh
+++ b/tools/push3-evolution/evolve.sh
@@ -462,12 +462,13 @@ for gen in $(seq 0 $((GENERATIONS - 1))); do
 
     if [ "${#_BATCH_FILES[@]}" -gt 0 ]; then
       BATCH_EC=0
-      bash "$BATCH_EVAL_SH" "${_BATCH_FILES[@]}" > "$BATCH_SCORES_FILE" 2>"${TMPDIR}/batch-eval.log" \
+      BATCH_EVAL_LOG="$WORK_DIR/batch-eval-gen-${gen}.log"
+      bash "$BATCH_EVAL_SH" "${_BATCH_FILES[@]}" > "$BATCH_SCORES_FILE" 2>"$BATCH_EVAL_LOG" \
         || BATCH_EC=$?
 
       if [ "$BATCH_EC" -ne 0 ]; then
-        echo "--- last 20 lines of ${TMPDIR}/batch-eval.log ---" >&2
-        tail -n 20 "${TMPDIR}/batch-eval.log" >&2
+        echo "--- last 20 lines of $BATCH_EVAL_LOG ---" >&2
+        tail -n 20 "$BATCH_EVAL_LOG" >&2
         echo "--- end batch-eval.log ---" >&2
       fi