diff --git a/evaluate/Jenkinsfile b/evaluate/Jenkinsfile
index 55dfd7c..88d5636 100644
--- a/evaluate/Jenkinsfile
+++ b/evaluate/Jenkinsfile
@@ -17,7 +17,7 @@ pipeline {
             steps {
                 copyArtifacts fingerprintArtifacts: true, projectName: 'z-s464980-create-dataset', selector: buildParameter('BUILD_SELECTOR')
                 copyArtifacts fingerprintArtifacts: true, projectName: 's464980-training/master', selector: buildParameter('BUILD_SELECTOR')
-                copyArtifacts fingerprintArtifacts: true, projectName: 's464980-evaluation/master', selector: buildParameter('BUILD_SELECTOR'. optional: true)
+                copyArtifacts fingerprintArtifacts: true, projectName: 's464980-evaluation/master', selector: buildParameter('BUILD_SELECTOR'. optional: 'true')
             }
         }
         stage("Prediction") {