diff --git a/tests/CI/gates.jenkinsfile b/tests/CI/gates.jenkinsfile
index e135656452..c065dd9774 100644
--- a/tests/CI/gates.jenkinsfile
+++ b/tests/CI/gates.jenkinsfile
@@ -100,7 +100,7 @@ pipeline {
 						withCredentials([usernamePassword(credentialsId: "${JENKINS_GERRIT_CREDS}",
 							passwordVariable: 'GERRIT_USER_PW', usernameVariable: 'GERRIT_USER_NAME')]) {
 
-							sh "printenv -0 | sort -z | tr '\0' '\n'"
+							sh "printenv -0 | sort -z | tr '\\0' '\\n'"
 
 							checkout scm: [$class: 'GitSCM',
 								branches: [[name: env.GERRIT_BRANCH ]],
diff --git a/tests/CI/periodics-daily.jenkinsfile b/tests/CI/periodics-daily.jenkinsfile
index 1dba606e70..42b4615c4a 100644
--- a/tests/CI/periodics-daily.jenkinsfile
+++ b/tests/CI/periodics-daily.jenkinsfile
@@ -43,7 +43,7 @@ pipeline {
 
 					stage ("Checkout") {
 						sh "sudo chown -R jenkins:users ."
-						sh "printenv -0 | sort -z | tr '\0' '\n'"
+						sh "printenv -0 | sort -z | tr '\\0' '\\n'"
 						sh "sudo tests/CI/setupJenkinsEnvironment.sh"
 					}
 
diff --git a/tests/CI/ref_debug.jenkinsfile b/tests/CI/ref_debug.jenkinsfile
index 82ace49246..d314bbd218 100644
--- a/tests/CI/ref_debug.jenkinsfile
+++ b/tests/CI/ref_debug.jenkinsfile
@@ -43,7 +43,7 @@ pipeline {
 
 					stage ("Checkout") {
 						sh "sudo chown -R jenkins:users ."
-						sh "printenv -0 | sort -z | tr '\0' '\n'"
+						sh "printenv -0 | sort -z | tr '\\0' '\\n'"
 						sh "sudo tests/CI/setupJenkinsEnvironment.sh"
 					}
 
diff --git a/tests/CI/unittests.jenkinsfile b/tests/CI/unittests.jenkinsfile
index 793d634374..f868723598 100644
--- a/tests/CI/unittests.jenkinsfile
+++ b/tests/CI/unittests.jenkinsfile
@@ -100,7 +100,7 @@ pipeline {
 						withCredentials([usernamePassword(credentialsId: "${JENKINS_GERRIT_CREDS}",
 							passwordVariable: 'GERRIT_USER_PW', usernameVariable: 'GERRIT_USER_NAME')]) {
 
-							sh "printenv -0 | sort -z | tr '\0' '\n'"
+							sh "printenv -0 | sort -z | tr '\\0' '\\n'"
 
 							checkout scm: [$class: 'GitSCM',
 								branches: [[name: env.GERRIT_BRANCH ]],