diff --git a/plugins/modules/portainer_stack.py b/plugins/modules/portainer_stack.py
index 6e532ed..2e05dc9 100644
--- a/plugins/modules/portainer_stack.py
+++ b/plugins/modules/portainer_stack.py
@@ -170,7 +170,8 @@ def handle_state_present(client, module):
         with open(module.params["docker_compose_file_path"]) as f:
             contents = f.read()
     elif module.params.get("stack_definition"):
-        contents = module.params["stack_definition"]
+        json_obj = json.load(module.params["stack_definition"])
+        contents = json.dumps(json_obj, indent=4)
     else:
         raise ValueError("Should not be able to be here!")