diff --git a/Documentation/filesystems/isofs.rst b/Documentation/filesystems/isofs.rst
index 08fd469091d4..2a30999b024f 100644
--- a/Documentation/filesystems/isofs.rst
+++ b/Documentation/filesystems/isofs.rst
@@ -57,7 +57,7 @@ Mount options unique to the isofs filesystem.
 Recommended documents about ISO 9660 standard are located at:
 
 - http://www.y-adagio.com/
-- ftp://ftp.ecma.ch/ecma-st/Ecma-119.pdf
+- https://ecma-international.org/wp-content/uploads/ECMA-119_2nd_edition_december_1987.pdf
 
 Quoting from the PDF "This 2nd Edition of Standard ECMA-119 is technically
 identical with ISO 9660.", so it is a valid and gratis substitute of the