diff --git a/.travis.yml b/.travis.yml
index 6cabe1d5f5..265f8194ee 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -66,4 +66,4 @@ script:
   - './factor -run=zealot.cli-changed-vocabs'
   - './factor -run=tools.test `./factor -run=zealot.cli-changed-vocabs | paste -s -d " " -`'
   - './factor -run=help.lint `./factor -run=zealot.cli-changed-vocabs | paste -s -d " " -`'
-  - "./factor -e='USING: modern.paths tools.test sequences system kernel math random ; core-vocabs os macosx? [ dup length 2/ sample ] when [ test ] each'"
+  - "./factor -e='USING: modern.paths tools.test sequences system kernel math random ; core-vocabs os macosx? [ dup length 3 /i sample ] when [ test ] each'"