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diff --git a/third_party/jpeg-xl/lib/jxl/huffman_table.h b/third_party/jpeg-xl/lib/jxl/huffman_table.h
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+++ b/third_party/jpeg-xl/lib/jxl/huffman_table.h
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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.
+
+#ifndef LIB_JXL_HUFFMAN_TABLE_H_
+#define LIB_JXL_HUFFMAN_TABLE_H_
+
+#include <stdint.h>
+#include <stdlib.h>
+
+namespace jxl {
+
+struct HuffmanCode {
+  uint8_t bits;   /* number of bits used for this symbol */
+  uint16_t value; /* symbol value or table offset */
+};
+
+/* Builds Huffman lookup table assuming code lengths are in symbol order. */
+/* Returns 0 in case of error (invalid tree or memory error), otherwise
+   populated size of table. */
+uint32_t BuildHuffmanTable(HuffmanCode* root_table, int root_bits,
+                           const uint8_t* code_lengths,
+                           size_t code_lengths_size, uint16_t* count);
+
+}  // namespace jxl
+
+#endif  // LIB_JXL_HUFFMAN_TABLE_H_