diff --git a/doc/index.html b/doc/index.html
index 95873d1..9c4336e 100644
--- a/doc/index.html
+++ b/doc/index.html
@@ -4175,7 +4175,7 @@ If available version number as major, minor, and patch.</p>
 <div class="sect3">
 <h4 id="_boost_lib_std_gnu"><a class="anchor" href="#_boost_lib_std_gnu"></a>4.4.13. <code>BOOST_LIB_STD_GNU</code></h4>
 <div class="paragraph">
-<p><a href="http://gcc.gnu.org/libstdc/[GNU libstdc" class="bare">http://gcc.gnu.org/libstdc/[GNU libstdc</a>] Standard C++ library.
+<p><a href="https://gcc.gnu.org/onlinedocs/libstdc%2b%2b/">GNU libstdc++</a> Standard C++ library.
 Version number available as year (from 1970), month, and day.</p>
 </div>
 <table class="tableblock frame-all grid-all stretch">
diff --git a/include/boost/predef/library/std/stdcpp3.h b/include/boost/predef/library/std/stdcpp3.h
index bc9717a..90aa3d1 100644
--- a/include/boost/predef/library/std/stdcpp3.h
+++ b/include/boost/predef/library/std/stdcpp3.h
@@ -16,7 +16,7 @@ http://www.boost.org/LICENSE_1_0.txt)
 /* tag::reference[]
 = `BOOST_LIB_STD_GNU`
 
-http://gcc.gnu.org/libstdc++/[GNU libstdc++] Standard {CPP} library.
+https://gcc.gnu.org/onlinedocs/libstdc%2b%2b/[GNU libstdc++] Standard {CPP} library.
 Version number available as year (from 1970), month, and day.
 
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