diff --git a/lib/std/os/uefi.zig b/lib/std/os/uefi.zig
index 6cfa2d24e4..1942165999 100644
--- a/lib/std/os/uefi.zig
+++ b/lib/std/os/uefi.zig
@@ -3,6 +3,8 @@
 // This file is part of [zig](https://ziglang.org/), which is MIT licensed.
 // The MIT license requires this copyright notice to be included in all copies
 // and substantial portions of the software.
+const std = @import("../std.zig");
+
 /// A protocol is an interface identified by a GUID.
 pub const protocols = @import("uefi/protocols.zig");
 
@@ -33,10 +35,10 @@ pub const Guid = extern struct {
         self: @This(),
         comptime f: []const u8,
         options: std.fmt.FormatOptions,
-        out_stream: anytype,
-    ) Errors!void {
+        writer: anytype,
+    ) !void {
         if (f.len == 0) {
-            return std.fmt.format(out_stream, "{x:0>8}-{x:0>4}-{x:0>4}-{x:0>2}{x:0>2}-{x:0>12}", .{
+            return std.fmt.format(writer, "{x:0>8}-{x:0>4}-{x:0>4}-{x:0>2}{x:0>2}-{x:0>12}", .{
                 self.time_low,
                 self.time_mid,
                 self.time_high_and_version,
@@ -48,6 +50,15 @@ pub const Guid = extern struct {
             @compileError("Unknown format character: '" ++ f ++ "'");
         }
     }
+
+    pub fn eql(a: std.os.uefi.Guid, b: std.os.uefi.Guid) bool {
+        return a.time_low == b.time_low and
+            a.time_mid == b.time_mid and
+            a.time_high_and_version == b.time_high_and_version and
+            a.clock_seq_high_and_reserved == b.clock_seq_high_and_reserved and
+            a.clock_seq_low == b.clock_seq_low and
+            std.mem.eql(u8, &a.node, &b.node);
+    }
 };
 
 /// An EFI Handle represents a collection of related interfaces.