diff --git a/django/db/models/query.py b/django/db/models/query.py
index ce7e295d524..67fcb411eb5 100644
--- a/django/db/models/query.py
+++ b/django/db/models/query.py
@@ -398,7 +398,7 @@ class QuerySet:
         # Remember, __aiter__ itself is synchronous, it's the thing it returns
         # that is async!
         async def generator():
-            await self._async_fetch_all()
+            await sync_to_async(self._fetch_all)()
             for item in self._result_cache:
                 yield item
 
@@ -1842,12 +1842,6 @@ class QuerySet:
         if self._prefetch_related_lookups and not self._prefetch_done:
             self._prefetch_related_objects()
 
-    async def _async_fetch_all(self):
-        if self._result_cache is None:
-            self._result_cache = [result async for result in self._iterable_class(self)]
-        if self._prefetch_related_lookups and not self._prefetch_done:
-            sync_to_async(self._prefetch_related_objects)()
-
     def _next_is_sticky(self):
         """
         Indicate that the next filter call and the one following that should
@@ -2025,12 +2019,6 @@ class RawQuerySet:
         if self._prefetch_related_lookups and not self._prefetch_done:
             self._prefetch_related_objects()
 
-    async def _async_fetch_all(self):
-        if self._result_cache is None:
-            self._result_cache = [result async for result in RawModelIterable(self)]
-        if self._prefetch_related_lookups and not self._prefetch_done:
-            sync_to_async(self._prefetch_related_objects)()
-
     def __len__(self):
         self._fetch_all()
         return len(self._result_cache)
@@ -2047,7 +2035,7 @@ class RawQuerySet:
         # Remember, __aiter__ itself is synchronous, it's the thing it returns
         # that is async!
         async def generator():
-            await self._async_fetch_all()
+            await sync_to_async(self._fetch_all)()
             for item in self._result_cache:
                 yield item