diff --git a/Makefile b/Makefile
index e22e48b..4429a08 100644
--- a/Makefile
+++ b/Makefile
@@ -42,7 +42,7 @@ puzzles: sudoku.csv
 	pv sudoku.csv | tail -n+2 | cut -d, -f1 | tr -d '\n' > $@
 
 results:
-	fallocate -l 729000000 $@
+	dd if=/dev/zero of=$@ bs=1000 count=729000
 
 run: sudoku puzzles results
 	time ./sudoku