diff --git a/Jenkinsfile b/Jenkinsfile
index 13c340f..3e5e474 100644
--- a/Jenkinsfile
+++ b/Jenkinsfile
@@ -13,8 +13,8 @@ pipeline {
         stage('Test R6RS implementations') {
             steps {
                 script {
-                    def r6rs_implementations = sh script: 'sash -L ./snow -L . compile-r7rs.scm --list-r6rs-schemes', returnStdout: true
-                    def r7rs_implementations = sh script: 'sash -L ./snow -L . compile-r7rs.scm --list-r7rs-schemes', returnStdout: true
+                    def r6rs_implementations = sh(script: 'sash -L ./snow -L . compile-r7rs.scm --list-r6rs-schemes', returnStdout: true).split()
+                    def r7rs_implementations = sh(script: 'sash -L ./snow -L . compile-r7rs.scm --list-r7rs-schemes', returnStdout: true).split()
 
                     r6rs_implementations.each { implementation->
                         stage("${implementation}") {