diff --git a/lib/std/os/uefi/tables/boot_services.zig b/lib/std/os/uefi/tables/boot_services.zig
index 31ac352089f8bcdafa0242e45cacbdc93a46070e..d5c3f128162251bd1b48a45abab5fe961a65257a 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) {
 
 pub const MemoryDescriptor = extern struct {
     type: MemoryType,
+    padding: u32,
     physical_start: u64,
     virtual_start: u64,
     number_of_pages: usize,