diff --git a/src/com/mirantis/mk/Workflow.groovy b/src/com/mirantis/mk/Workflow.groovy
index 86ca836..e8f4ba2 100644
--- a/src/com/mirantis/mk/Workflow.groovy
+++ b/src/com/mirantis/mk/Workflow.groovy
@@ -225,7 +225,9 @@
     }
     // Inject hidden random parameter (is not showed in jjb) to be sure we are triggering unique downstream job.
     // Most actual case - parallel run for same jobs( but with different params)
-    parameters.addAll([string(name: 'RANDOM_SEED_STRING', value: "${env.JOB_NAME.toLowerCase()}-${env.BUILD_NUMBER}-${UUID.randomUUID().toString().split('-')[0]}")])
+    parameters.add([$class: "StringParameterValue",
+                    name  : "RANDOM_SEED_STRING",
+                    value : "${env.JOB_NAME.toLowerCase()}-${env.BUILD_NUMBER}-${UUID.randomUUID().toString().split('-')[0]}"])
     common.infoMsg(_msg)
     return parameters
 }