diff --git a/tests/CI/gates.jenkinsfile b/tests/CI/gates.jenkinsfile
index 284b0feab3..e52d3a4cd3 100644
--- a/tests/CI/gates.jenkinsfile
+++ b/tests/CI/gates.jenkinsfile
@@ -240,8 +240,10 @@ pipeline {
 	}
 	post {
 		cleanup {
-			if (env.CLEANUP_WS_GATES.toBoolean()) {
-				cleanWs deleteDirs: true, notFailBuild: false
+			script {
+				if (env.CLEANUP_WS_GATES.toBoolean()) {
+					cleanWs deleteDirs: true, notFailBuild: false
+				}
 			}
 		}
 		/*
diff --git a/tests/CI/periodics-daily.jenkinsfile b/tests/CI/periodics-daily.jenkinsfile
index 4934c12141..11e9ed379a 100644
--- a/tests/CI/periodics-daily.jenkinsfile
+++ b/tests/CI/periodics-daily.jenkinsfile
@@ -159,8 +159,10 @@ pipeline {
 	}
 	post {
 		cleanup {
-			if (env.CLEANUP_WS_DAILIES.toBoolean()) {
-				cleanWs deleteDirs: true, notFailBuild: false
+			script {
+				if (env.CLEANUP_WS_DAILIES.toBoolean()) {
+					cleanWs deleteDirs: true, notFailBuild: false
+				}
 			}
 		}
 		success {
diff --git a/tests/CI/ref_debug.jenkinsfile b/tests/CI/ref_debug.jenkinsfile
index a2bfdbaead..31fc85d4d9 100644
--- a/tests/CI/ref_debug.jenkinsfile
+++ b/tests/CI/ref_debug.jenkinsfile
@@ -129,8 +129,10 @@ pipeline {
 	}
 	post {
 		cleanup {
-			if (env.CLEANUP_WS_REF_DEBUG.toBoolean()) {
-				cleanWs deleteDirs: true, notFailBuild: false
+			script {
+				if (env.CLEANUP_WS_REF_DEBUG.toBoolean()) {
+					cleanWs deleteDirs: true, notFailBuild: false
+				}
 			}
 		}
 		success {