diff --git a/src/atlas/resources/results/results.py b/src/atlas/resources/results/results.py
index 81fe210..df8cc26 100644
--- a/src/atlas/resources/results/results.py
+++ b/src/atlas/resources/results/results.py
@@ -133,8 +133,7 @@ async def get_by_id(
         effective_page = page if page is not None else DEFAULT_PAGE
 
         params["page"] = str(effective_page)
-        if page_size is not None:
-            params["pageSize"] = str(page_size)
+        params["pageSize"] = str(effective_page_size)
 
         # Get the response with cast_to to get parsed data
         resp = await self._get(