diff --git a/sdk/python/kfp_tekton/compiler/compiler.py b/sdk/python/kfp_tekton/compiler/compiler.py
index dc1c5c550be..a92e41870c9 100644
--- a/sdk/python/kfp_tekton/compiler/compiler.py
+++ b/sdk/python/kfp_tekton/compiler/compiler.py
@@ -371,7 +371,7 @@ def _group_to_dag_template(self, group, inputs, outputs, dependencies, pipeline_
             sanitized_tasks.append(c_dict)
           loop_args_str_value = json.dumps(sanitized_tasks, sort_keys=True)
         else:
-          loop_args_str_value = str(loop_arg_value)
+          loop_args_str_value = json.dumps(loop_arg_value)
 
         self.loops_pipeline[group_name]['spec']['params'] = [{
           "name": sub_group.loop_args.full_name,