diff --git a/sources/org/workflowsim/clustering/BasicClustering.java b/sources/org/workflowsim/clustering/BasicClustering.java
index 0e34bb79..7bb4e734 100644
--- a/sources/org/workflowsim/clustering/BasicClustering.java
+++ b/sources/org/workflowsim/clustering/BasicClustering.java
@@ -167,7 +167,7 @@ protected final Job addTasks2Job(List<Task> taskList) {
             int priority = 0;
             int depth = 0;
             /// a bug of cloudsim makes it final of input file size and output file size
-            Job job = new Job(idIndex, length/*, inputFileSize, outputFileSize*/);
+            Job job = new Job(idIndex + 1 , length/*, inputFileSize, outputFileSize*/);
             job.setClassType(ClassType.COMPUTE.value);
             for (Task task : taskList) {
                 length += task.getCloudletLength();