diff --git a/decode.go b/decode.go
index 65198ca..a77a639 100644
--- a/decode.go
+++ b/decode.go
@@ -925,8 +925,8 @@ func readBlockLength(table []huffmanCode, br *bitReader) uint32 {
 	var code uint32
 	var nbits uint32
 	code = readSymbol(table, br)
-	nbits = uint32(kBlockLengthPrefixCode1[code].nbits) /* nbits == 2..24 */
-	return uint32(kBlockLengthPrefixCode1[code].offset) + readBits(br, nbits)
+	nbits = kBlockLengthPrefixCode[code].nbits /* nbits == 2..24 */
+	return kBlockLengthPrefixCode[code].offset + readBits(br, nbits)
 }
 
 /* WARNING: if state is not BROTLI_STATE_READ_BLOCK_LENGTH_NONE, then
@@ -942,14 +942,14 @@ func safeReadBlockLength(s *Reader, result *uint32, table []huffmanCode, br *bit
 	}
 	{
 		var bits uint32 /* nbits == 2..24 */
-		var nbits uint32 = uint32(kBlockLengthPrefixCode1[index].nbits)
+		var nbits uint32 = kBlockLengthPrefixCode[index].nbits
 		if !safeReadBits(br, nbits, &bits) {
 			s.block_length_index = index
 			s.substate_read_block_length = BROTLI_STATE_READ_BLOCK_LENGTH_SUFFIX
 			return false
 		}
 
-		*result = uint32(kBlockLengthPrefixCode1[index].offset) + bits
+		*result = kBlockLengthPrefixCode[index].offset + bits
 		s.substate_read_block_length = BROTLI_STATE_READ_BLOCK_LENGTH_NONE
 		return true
 	}
diff --git a/prefix_dec.go b/prefix_dec.go
index b24c8d0..1efe822 100644
--- a/prefix_dec.go
+++ b/prefix_dec.go
@@ -6,126 +6,6 @@ package brotli
    See file LICENSE for detail or copy at https://opensource.org/licenses/MIT
 */
 
-/* Lookup tables to map prefix codes to value ranges. This is used during
-   decoding of the block lengths, literal insertion lengths and copy lengths. */
-
-/* Represents the range of values belonging to a prefix code:
-   [offset, offset + 2^nbits) */
-type prefixCodeRange1 struct {
-	offset uint16
-	nbits  byte
-}
-
-var kBlockLengthPrefixCode1 = [numBlockLenSymbols]struct {
-	offset uint16
-	nbits  byte
-}{
-	struct {
-		offset uint16
-		nbits  byte
-	}{1, 2},
-	struct {
-		offset uint16
-		nbits  byte
-	}{5, 2},
-	struct {
-		offset uint16
-		nbits  byte
-	}{9, 2},
-	struct {
-		offset uint16
-		nbits  byte
-	}{13, 2},
-	struct {
-		offset uint16
-		nbits  byte
-	}{17, 3},
-	struct {
-		offset uint16
-		nbits  byte
-	}{25, 3},
-	struct {
-		offset uint16
-		nbits  byte
-	}{33, 3},
-	struct {
-		offset uint16
-		nbits  byte
-	}{41, 3},
-	struct {
-		offset uint16
-		nbits  byte
-	}{49, 4},
-	struct {
-		offset uint16
-		nbits  byte
-	}{65, 4},
-	struct {
-		offset uint16
-		nbits  byte
-	}{81, 4},
-	struct {
-		offset uint16
-		nbits  byte
-	}{97, 4},
-	struct {
-		offset uint16
-		nbits  byte
-	}{113, 5},
-	struct {
-		offset uint16
-		nbits  byte
-	}{145, 5},
-	struct {
-		offset uint16
-		nbits  byte
-	}{177, 5},
-	struct {
-		offset uint16
-		nbits  byte
-	}{209, 5},
-	struct {
-		offset uint16
-		nbits  byte
-	}{241, 6},
-	struct {
-		offset uint16
-		nbits  byte
-	}{305, 6},
-	struct {
-		offset uint16
-		nbits  byte
-	}{369, 7},
-	struct {
-		offset uint16
-		nbits  byte
-	}{497, 8},
-	struct {
-		offset uint16
-		nbits  byte
-	}{753, 9},
-	struct {
-		offset uint16
-		nbits  byte
-	}{1265, 10},
-	struct {
-		offset uint16
-		nbits  byte
-	}{2289, 11},
-	struct {
-		offset uint16
-		nbits  byte
-	}{4337, 12},
-	struct {
-		offset uint16
-		nbits  byte
-	}{8433, 13},
-	struct {
-		offset uint16
-		nbits  byte
-	}{16625, 24},
-}
-
 type CmdLutElement struct {
 	insert_len_extra_bits byte
 	copy_len_extra_bits   byte