diff --git a/do.sh b/do.sh
index 275d82e..c66b758 100755
--- a/do.sh
+++ b/do.sh
@@ -23,7 +23,8 @@ fmt() {
 	else
 		poetry run black .
 	fi
-	find . -type f -name "*.py" -exec sed -i -e 's/    /\t/g' {} \;
+	find tantri -type f -name "*.py" -exec sed -i -e 's/    /\t/g' {} \;
+	find tests -type f -name "*.py" -exec sed -i -e 's/    /\t/g' {} \;
 }
 
 test() {