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-rw-r--r--doc/src/sgml/isn.sgml2
1 files changed, 1 insertions, 1 deletions
diff --git a/doc/src/sgml/isn.sgml b/doc/src/sgml/isn.sgml
index 598dda2e9a8..13040417264 100644
--- a/doc/src/sgml/isn.sgml
+++ b/doc/src/sgml/isn.sgml
@@ -356,7 +356,7 @@ SELECT isbn13(id) FROM test;
several sites, including:
<itemizedlist>
<listitem><para><ulink url="https://www.isbn-international.org/"></ulink></para></listitem>
- <listitem><para><ulink url="http://www.issn.org/"></ulink></para></listitem>
+ <listitem><para><ulink url="https://www.issn.org/"></ulink></para></listitem>
<listitem><para><ulink url="https://www.ismn-international.org/"></ulink></para></listitem>
<listitem><para><ulink url="https://www.wikipedia.org/"></ulink></para></listitem>
</itemizedlist>