diff --git a/src/to_hex.zig b/src/to_hex.zig
index d6c245a6fa8212582a2bf0f787308dc34b6487cc..51ed1eedd29ccfdf645b52b8484c4f44b06c1afa 100644
--- a/src/to_hex.zig
+++ b/src/to_hex.zig
@@ -2,11 +2,23 @@ const std = @import("std");
 const string = []const u8;
 const extras = @import("./lib.zig");
 const rawIntBytes = extras.rawIntBytes;
+const digits = "0123456789abcdef";
+
+const alphabet = blk: {
+    var data: [512]u8 = @splat('0');
+    for (0..16) |m| {
+        for (0..16) |n| {
+            data[(m * 16 + n) * 2 + 0] = digits[m];
+            data[(m * 16 + n) * 2 + 1] = digits[n];
+        }
+    }
+    const result = data;
+    break :blk result;
+};
 
 pub fn to_hex(array: anytype) [array.len * 2]u8 {
     var res: [array.len * 2]u8 = undefined;
-    var fbs = std.io.fixedBufferStream(&res);
-    std.fmt.format(fbs.writer(), "{x}", .{std.fmt.fmtSliceHexLower(&array)}) catch unreachable;
+    for (&array, 0..) |x, i| res[i * 2 ..][0..2].* = alphabet[@as(usize, x) * 2 ..][0..2].*;
     return res;
 }