diff --git a/DuetPkg/BootSector/bs16.S b/DuetPkg/BootSector/bs16.S
index 133a9c2570..440732ee72 100644
--- a/DuetPkg/BootSector/bs16.S
+++ b/DuetPkg/BootSector/bs16.S
@@ -18,7 +18,7 @@
         #.MODEL small
         .stack: 
         .486p: 
-        .code: 
+        .code16:  
 
 .equ                      FAT_DIRECTORY_ENTRY_SIZE, 0x020
 .equ                      FAT_DIRECTORY_ENTRY_SHIFT, 5
diff --git a/DuetPkg/BootSector/bs32.S b/DuetPkg/BootSector/bs32.S
index f2e3b91454..72fa21011b 100644
--- a/DuetPkg/BootSector/bs32.S
+++ b/DuetPkg/BootSector/bs32.S
@@ -18,7 +18,7 @@
         #.MODEL small
         #.stack: 
         #.486p: 
-        #.code: 
+        .code16: 
 .section .text
 
 .equ                      FAT_DIRECTORY_ENTRY_SIZE, 0x0020
diff --git a/DuetPkg/BootSector/efi32.S b/DuetPkg/BootSector/efi32.S
index 421271c516..7f9e77dea7 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