diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 249ef1a..d7bea65 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -170,6 +170,7 @@ jobs:
       - name: build example
         timeout-minutes: 20
         run: |
+          set -ex
           export DISPLAY=:1.0
           export PATH="$HOME/arduino_ide:$PATH"
           source $GITHUB_WORKSPACE/travis/common.sh
diff --git a/travis/common.sh b/travis/common.sh
index 81d60e9..c1c2328 100644
--- a/travis/common.sh
+++ b/travis/common.sh
@@ -1,5 +1,7 @@
 #!/bin/bash
 
+set -ex
+
 function build_sketches()
 {
     local arduino=$1