diff --git a/src/lib.zig b/src/lib.zig
index b200eeeaa3e0a87c97123fd55d0f591638d49419..8a26c8d76e4eef1dc0a027ffb542c45b2d95917f 100644
--- a/src/lib.zig
+++ b/src/lib.zig
@@ -40,6 +40,7 @@ pub const isArrayOf = @import("./isArrayOf.zig").isArrayOf;
 pub const parse_int = @import("./parse_int.zig").parse_int;
 pub const parse_bool = @import("./parse_bool.zig").parse_bool;
 pub const to_hex = @import("./to_hex.zig").to_hex;
+pub const to_HEX = @import("./to_hex.zig").to_HEX;
 pub const FieldUnion = @import("./FieldUnion.zig").FieldUnion;
 pub const LoggingReader = @import("./LoggingReader.zig").LoggingReader;
 pub const LoggingWriter = @import("./LoggingWriter.zig").LoggingWriter;
diff --git a/src/to_hex.zig b/src/to_hex.zig
index 51ed1eedd29ccfdf645b52b8484c4f44b06c1afa..f998d5dd6fb01c5c32a9a433b636f589dce22d79 100644
--- a/src/to_hex.zig
+++ b/src/to_hex.zig
@@ -22,6 +22,16 @@ pub fn to_hex(array: anytype) [array.len * 2]u8 {
     return res;
 }
 
+pub fn to_HEX(array: anytype) [array.len * 2]u8 {
+    var res: [array.len * 2]u8 = undefined;
+    for (&array, 0..) |x, i| res[i * 2 ..][0..2].* = alphabet[@as(usize, x) * 2 ..][0..2].*;
+    for (&res) |*x| x.* = std.ascii.toUpper(x.*);
+    return res;
+}
+
 test {
     try std.testing.expect(std.mem.eql(u8, &to_hex(rawIntBytes(u64, 0x4e5a7da9f3f1d132)), "4e5a7da9f3f1d132"));
 }
+test {
+    try std.testing.expect(std.mem.eql(u8, &to_hex(rawIntBytes(u64, 0x4e5a7da9f3f1d132)), "4E5A7dA9F3F1D132"));
+}