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diff --git a/lib/memchr.valgrind b/lib/memchr.valgrind
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+# Suppress a valgrind message about use of uninitialized memory in memchr().
+
+# Copyright (C) 2009-2023 Free Software Foundation, Inc.
+#
+# This file is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Lesser General Public License as
+# published by the Free Software Foundation; either version 2.1 of the
+# License, or (at your option) any later version.
+#
+# This file is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public License
+# along with this program. If not, see <https://www.gnu.org/licenses/>.
+
+# POSIX states that when the character is found, memchr must not read extra
+# bytes in an overestimated length (for example, where memchr is used to
+# implement strnlen). However, we use a safe word read to provide a speedup.
+{
+ memchr-value4
+ Memcheck:Value4
+ fun:rpl_memchr
+}
+{
+ memchr-value8
+ Memcheck:Value8
+ fun:rpl_memchr
+}