diff --git a/DuetPkg/BootSector/efi32.S b/DuetPkg/BootSector/efi32.S
index 06b2516ba7..a93f350c5b 100644
--- a/DuetPkg/BootSector/efi32.S
+++ b/DuetPkg/BootSector/efi32.S
@@ -22,7 +22,7 @@
         .486: 
         #.MODEL flat
         .stack: 
-        .code:
+        .code16
         .org 0x21000
 
 .equ                 DEFAULT_HANDLER_SIZE, INT1 - INT0