diff --git a/scripts/sphinx-pre-install b/scripts/sphinx-pre-install
index 0b44d51c4991..f230e65329a2 100755
--- a/scripts/sphinx-pre-install
+++ b/scripts/sphinx-pre-install
@@ -5,8 +5,11 @@ use strict;
 # Copyright (c) 2017-2019 Mauro Carvalho Chehab <mchehab@kernel.org>
 #
 
-my $conf = "Documentation/conf.py";
-my $requirement_file = "Documentation/sphinx/requirements.txt";
+my $prefix = "./";
+$prefix = "$ENV{'srctree'}/" if ($ENV{'srctree'});
+
+my $conf = $prefix . "Documentation/conf.py";
+my $requirement_file = $prefix . "Documentation/sphinx/requirements.txt";
 my $virtenv_prefix = "sphinx_";
 
 #