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diff --git a/third_party/jpeg-xl/lib/jxl/simd_util.cc b/third_party/jpeg-xl/lib/jxl/simd_util.cc
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+// Copyright (c) the JPEG XL Project Authors. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+#include "lib/jxl/simd_util.h"
+
+#undef HWY_TARGET_INCLUDE
+#define HWY_TARGET_INCLUDE "lib/jxl/simd_util.cc"
+#include <hwy/foreach_target.h>
+#include <hwy/highway.h>
+
+HWY_BEFORE_NAMESPACE();
+namespace jxl {
+namespace HWY_NAMESPACE {
+
+size_t MaxVectorSize() {
+ HWY_FULL(float) df;
+ return Lanes(df) * sizeof(float);
+}
+
+// NOLINTNEXTLINE(google-readability-namespace-comments)
+} // namespace HWY_NAMESPACE
+} // namespace jxl
+HWY_AFTER_NAMESPACE();
+
+#if HWY_ONCE
+namespace jxl {
+
+HWY_EXPORT(MaxVectorSize);
+
+size_t MaxVectorSize() {
+ // Ideally HWY framework should provide us this value.
+ // Less than ideal is to check all available targets and choose maximal.
+ // As for now, we just ask current active target, assuming it won't change.
+ return HWY_DYNAMIC_DISPATCH(MaxVectorSize)();
+}
+
+} // namespace jxl
+#endif