diff --git a/clarifai/runners/utils/data_utils.py b/clarifai/runners/utils/data_utils.py
index d3eee0bd..f19ae3df 100644
--- a/clarifai/runners/utils/data_utils.py
+++ b/clarifai/runners/utils/data_utils.py
@@ -615,7 +615,7 @@ def convert_output_data_to_old_format(cls, data: resources_pb2.Data) -> resource
         old_data = part_data
         if old_data.string_value:
             old_data.text.raw = old_data.string_value
-
+            old_data.ClearField('string_value')
         return old_data
 
     @classmethod