According with:
	https://www.sphinx-doc.org/en/master/latex.html

The variable that handles paper size changed during version 1.5,
as pointed at:
	https://www.sphinx-doc.org/en/master/changes/1.5.html

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
---
 Documentation/Makefile | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/Documentation/Makefile b/Documentation/Makefile
index 820f07e0afe6..2ed334971acd 100644
--- a/Documentation/Makefile
+++ b/Documentation/Makefile
@@ -60,8 +60,8 @@ ifeq ($(HAVE_LATEXMK),1)
 endif #HAVE_LATEXMK
 
 # Internal variables.
-PAPEROPT_a4     = -D latex_paper_size=a4
-PAPEROPT_letter = -D latex_paper_size=letter
+PAPEROPT_a4     = -D latex_elements.papersize=a4paper
+PAPEROPT_letter = -D latex_elements.papersize=letterpaper
 ALLSPHINXOPTS   = -D kerneldoc_srctree=$(srctree) -D kerneldoc_bin=$(KERNELDOC)
 ALLSPHINXOPTS   += $(PAPEROPT_$(PAPER)) $(SPHINXOPTS)
 ifneq ($(wildcard $(srctree)/.config),)
-- 
2.50.1