diff --git a/.travis.yml b/.travis.yml
index b7e8b1f..f4f6a18 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -10,4 +10,4 @@ python:
   - "3.6"
 script:
   - (set -e; for i in 0?-*.md; do echo "Extracting $i"; python3 tools/extract-formats.py --message-types --message-fields --check-alignment $i; done)
-  - tools/spellcheck.sh --check 0?*.md
+  - tools/spellcheck.sh --check [0-9][0-9]-*.md