diff --git a/Jenkinsfile_Common b/Jenkinsfile_Common
index 17380e6..a8ad9b9 100644
--- a/Jenkinsfile_Common
+++ b/Jenkinsfile_Common
@@ -26,8 +26,8 @@ echo "loading common yocto build module..."
 
 def cleanWorkspace() {
   println "cleaning workspace..."
-  sh "[[ -d \"${WORKSPACE}/build-common/sstate-cache\" ]] && find \"${WORKSPACE}/build-common/sstate-cache/\" -name \"sstate*\" -atime +3 -delete || true"
-  sh "[[ -d \"${env.SHARED_BUILD}/tmp/work\" ]] && find \"${env.SHARED_BUILD}/tmp/work/\" -name temp -type d -exec rm -rf {} + || true"
+  sh "[ -d \"${WORKSPACE}/build-common/sstate-cache\" ] && find \"${WORKSPACE}/build-common/sstate-cache/\" -name \"sstate*\" -atime +3 -delete || true"
+  sh "[ -d \"${env.SHARED_BUILD}/tmp/work\" ] && find \"${env.SHARED_BUILD}/tmp/work/\" -name temp -type d -exec rm -rf {} + || true"
 }