diff --git a/controllers.py b/controllers.py
index 717729a450..2070d5b050 100644
--- a/controllers.py
+++ b/controllers.py
@@ -392,7 +392,9 @@ def post(self, query_id):
         if 'data_source_id' in query_def:
             query_def['data_source'] = query_def.pop('data_source_id')
 
-        query_def['last_modified_by'] = self.current_user
+        # Don't set "last_modified_by" if the user only refreshing this query
+        if not ('latest_query_data' in query_def and len(query_def.keys()) == 1):
+            query_def['last_modified_by'] = self.current_user
 
         # TODO: use #save() with #dirty_fields.
         models.Query.update_instance(query_id, **query_def)