diff --git a/t/clean.do b/t/clean.do
index a78b666..13f562a 100644
--- a/t/clean.do
+++ b/t/clean.do
@@ -1,4 +1,4 @@
-/bin/ls [0-9][0-9][0-9]*/clean.do |
+/bin/ls [0-9s][0-9][0-9]*/clean.do |
 sed 's/\.do$//' |
 xargs redo