diff --git a/pipelines/build/prTester/pr_test_pipeline.groovy b/pipelines/build/prTester/pr_test_pipeline.groovy
index 084f21a95..0d4c8ef89 100644
--- a/pipelines/build/prTester/pr_test_pipeline.groovy
+++ b/pipelines/build/prTester/pr_test_pipeline.groovy
@@ -163,6 +163,7 @@ class PullRequestTestPipeline implements Serializable {
                                     context.booleanParam(name: 'enableInstallers', value: false), // never need this enabled in pr-test
                                     context.booleanParam(name: 'useAdoptBashScripts', value: false), // should not use defaultsJson but adoptDefaultsJson
                                     context.booleanParam(name: 'keepReleaseLogs', value: false), // never need this enabled in pr-tester
+                                    context.booleanParam(name: 'cleanWorkspace', value: true) // always clean prtester workspace before the build
                                     context.booleanParam(name: 'cleanWorkspaceAfterBuild', value: true) // always clean prtester workspace after the build
                                 ]
                         } catch (err) {