diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 80e0cb8f864ff3ea061cd4b365c73c331f49ddf5..91b74ae3bdf7b36bb9a044572dfff5a48e914770 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -28,7 +28,7 @@ build-job:       # This job runs in the build stage, which runs first.
     - build
   script:
     - echo "Test with command substitution"
-    - FILES=$(ls)
+    - FILES=$(ls file_not_exist.txt)
     - echo $FILES
     - echo "Compiling the code..."
     - echo "Compile complete."