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-rw-r--r--doc/posix-functions/dup2.texi2
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diff --git a/doc/posix-functions/dup2.texi b/doc/posix-functions/dup2.texi
index 71ac912990..c7bc2123d6 100644
--- a/doc/posix-functions/dup2.texi
+++ b/doc/posix-functions/dup2.texi
@@ -2,7 +2,7 @@
@section @code{dup2}
@findex dup2
-POSIX specification:@* @url{http://www.opengroup.org/onlinepubs/9699919799/functions/dup2.html}
+POSIX specification:@* @url{https://pubs.opengroup.org/onlinepubs/9699919799/functions/dup2.html}
Gnulib module: dup2 or dup2-obsolete