diff --git a/.travis b/.travis
index 1be428a..3bf3a13 100644
--- a/.travis
+++ b/.travis
@@ -1,2 +1,3 @@
+language: shell
 script:
-  - shellcheck ./scripts/*/*.sh
+  - bash -c 'shopt -s globstar nullglob; shellcheck **/*.{sh,ksh,bash}'