diff --git a/TravisCI.md b/TravisCI.md
index bfbb252..1f40f84 100644
--- a/TravisCI.md
+++ b/TravisCI.md
@@ -5,7 +5,7 @@ For a truly simple configuration, place the following in your `.travis.yml`:
 ```yaml
 language: shell
 script:
-  - bash -c 'shopt -s globstar; shellcheck **/*.{sh,ksh,bash}'
+  - bash -c 'shopt -s globstar nullglob; shellcheck **/*.{sh,ksh,bash}'
 ```
 
 Note: