diff --git a/src/backend/langflow/api/v1/validate.py b/src/backend/langflow/api/v1/validate.py
index 362430cf8..aa3748785 100644
--- a/src/backend/langflow/api/v1/validate.py
+++ b/src/backend/langflow/api/v1/validate.py
@@ -74,7 +74,11 @@ def add_new_variables_to_template(input_variables, prompt_request):
                 multiline=True,
                 input_types=["Document", "BaseOutputParser"],
             )
-
+            if variable in prompt_request.frontend_node.template:
+                # Set the new field with the old value
+                template_field.value = prompt_request.frontend_node.template[variable][
+                    "value"
+                ]
             prompt_request.frontend_node.template[variable] = template_field.to_dict()
 
             # Check if variable is not already in the list before appending