diff --git a/cicd-lab-pipeline.groovy b/cicd-lab-pipeline.groovy
index f0cc9e8..1294e35 100644
--- a/cicd-lab-pipeline.groovy
+++ b/cicd-lab-pipeline.groovy
@@ -131,8 +131,10 @@
 
         retry(30) {
             out = salt.cmdRun(saltMaster, 'I@docker:swarm:role:master', """/bin/bash -c 'docker service ls | grep -E "0/[0-9]+"' && echo 'Some services are not running'""")
-            for (entry in out['return']) {
-                for (node in entry) {
+            for (int a = 0; a < out['return'].length(); a++) {
+                def entry = a
+                for (int i = 0; i < entry.length(); i++)
+                    def node = entry[i]
                     if (node.value =~ /Some services are not running/) {
                         sleep(10)
                         throw new Exception("$node.key: $node.value")