diff --git a/web3.js/.travis/script.sh b/web3.js/.travis/script.sh
index 8257f1b6de..74361ace0d 100644
--- a/web3.js/.travis/script.sh
+++ b/web3.js/.travis/script.sh
@@ -1,5 +1,7 @@
 # |source| this file
 
+set -ex
+
 ls -l lib
 test -r lib/index.iife.js
 test -r lib/index.cjs.js