diff --git a/api/models/workflow.py b/api/models/workflow.py
index 853d5afefc..c04e4e9762 100644
--- a/api/models/workflow.py
+++ b/api/models/workflow.py
@@ -1506,6 +1506,7 @@ class WorkflowDraftVariable(Base):
         file_id: str | None = None,
     ) -> "WorkflowDraftVariable":
         variable = WorkflowDraftVariable()
+        variable.id = str(uuid4())
         variable.created_at = naive_utc_now()
         variable.updated_at = naive_utc_now()
         variable.description = description
diff --git a/api/services/workflow_draft_variable_service.py b/api/services/workflow_draft_variable_service.py
index f299ce3baa..9407a2b3f0 100644
--- a/api/services/workflow_draft_variable_service.py
+++ b/api/services/workflow_draft_variable_service.py
@@ -679,6 +679,7 @@ def _batch_upsert_draft_variable(
 
 def _model_to_insertion_dict(model: WorkflowDraftVariable) -> dict[str, Any]:
     d: dict[str, Any] = {
+        "id": model.id,
         "app_id": model.app_id,
         "last_edited_at": None,
         "node_id": model.node_id,