diff --git a/sphinx/builders/__init__.py b/sphinx/builders/__init__.py
index 4fc57cd16a5..ff26412a96b 100644
--- a/sphinx/builders/__init__.py
+++ b/sphinx/builders/__init__.py
@@ -664,7 +664,7 @@ def on_chunk_done(args: list[tuple[str, NoneType]], result: NoneType) -> None:
             logger.info(f'{measure_1}: {self.runtime[measure_1]}')
             logger.info(f'{measure_2}: {self.runtime[measure_2]}')
 
-            with WorkerPool(n_jobs=nproc, start_method='fork', use_dill=False, pass_worker_id=True, enable_insights=True) as pool:
+            with WorkerPool(n_jobs=nproc, start_method='fork', use_dill=True, pass_worker_id=True, enable_insights=True) as pool:
                 # args = []
                 # for docname in docnames:
                 #     doctree = self.env.get_and_resolve_doctree(docname, self)