diff --git a/lib/std/os/uefi/tables/boot_services.zig b/lib/std/os/uefi/tables/boot_services.zig
index d0cd2ba11c..908dc79152 100644
--- a/lib/std/os/uefi/tables/boot_services.zig
+++ b/lib/std/os/uefi/tables/boot_services.zig
@@ -179,6 +179,7 @@ pub const MemoryType = enum(u32) {
     PalCode,
     PersistentMemory,
     MaxMemoryType,
+    _,
 };
 
 pub const MemoryDescriptor = extern struct {