diff --git a/Jenkinsfile_evaluation b/Jenkinsfile_evaluation
index c7f02a2..9f3c189 100644
--- a/Jenkinsfile_evaluation
+++ b/Jenkinsfile_evaluation
@@ -31,7 +31,7 @@ pipeline {
         }
       stage('Evaluation') {
          steps {
-         	sh 'buildNumber=$(echo ${env.BUILD_NUMBER})'
+         	sh 'buildNumber=$(echo $BUILD_NUMBER)'
             sh 'python3 "./lab06-eval.py $buildNumber"'
             sh 'python3 "./lab06-plot.py"'
             sh 'python3 "./lab07_sacred01.py"'