diff --git a/Jenkinsfile.internal b/Jenkinsfile.internal
index de0bdeea..6589c1b0 100644
--- a/Jenkinsfile.internal
+++ b/Jenkinsfile.internal
@@ -34,6 +34,8 @@ pipeline {
             failFast false
             parallel {
                 stage('System Tests') {
+                    // The needed artifact is only built for main and pull requests -> skip this job otherwise
+                    when { branch pattern: "PR-\\d+|main", comparator: "REGEXP"}
                     steps {
                         build job: '../systemTests', parameters: [string(name: 'artifactName', value: "${JOB_BASE_NAME}"), string(name: 'commitHash', value: "${GIT_COMMIT}")]
                     }