diff --git a/TravisCI.md b/TravisCI.md
index 162aa5f..28a38df 100644
--- a/TravisCI.md
+++ b/TravisCI.md
@@ -16,7 +16,7 @@ addons:
     - shellcheck
 
 script:
- - shellcheck *.sh
+ - bash -c 'shopt -s globstar; shellcheck **/*.{sh,bash}'
 
 matrix:
   fast_finish: true