diff --git a/lib/std/coff.zig b/lib/std/coff.zig
index 066904c2f395778b9806fe8470c42ef99d1ed0dd..48b6cd384c32570dee715a69fdc086248083840e 100644
--- a/lib/std/coff.zig
+++ b/lib/std/coff.zig
@@ -992,6 +992,8 @@ pub const MachineType = enum(u16) {
     ARM = 0x1c0,
     /// ARM64 little endian
     ARM64 = 0xaa64,
+    /// ARM64EC
+    ARM64EC = 0xa641,
     /// ARM Thumb-2 little endian
     ARMNT = 0x1c4,
     /// EFI byte code