diff --git a/.gitlab-ci-build.yml.in b/.gitlab-ci-build.yml.in
index 354e05a..ccfd898 100644
--- a/.gitlab-ci-build.yml.in
+++ b/.gitlab-ci-build.yml.in
@@ -80,13 +80,12 @@ hyperv-iso.amd64:
   parallel:
     matrix: []
   script:
-    - echo $env:COMMAND > build.ps1
-    - echo 'if (-not $?) { throw "Error in build"}' >> build.ps1
-    - pwsh.exe .\build.ps1
+    - echo $COMMAND > build.sh
+    - bash build.sh || exit 1
   after_script: |-
-    if ( "$CI_JOB_STATUS" -eq "success" ) {
+    if [ "$CI_JOB_STATUS" == "success" ]; then
       xonsh test.xsh
-    }
+    fi
 
 "Create release":
   stage: release