diff --git a/mev b/mev
index 80f3b5b..f2bb34e 100755
--- a/mev
+++ b/mev
@@ -33,7 +33,7 @@ case "$1" in
         n_workers=$4
 
         echo "Backfilling from $start_block_number to $end_block_number with $n_workers workers"
-        python backfill.py $start_block_number $end_block_number $n_workers
+        poetry run python backfill.py $start_block_number $end_block_number $n_workers
 	;;
   inspect)
         block_number=$2