diff --git a/DuetPkg/BootSector/bs32.S b/DuetPkg/BootSector/bs32.S
index 5d876739f9..f01f5bf7d1 100644
--- a/DuetPkg/BootSector/bs32.S
+++ b/DuetPkg/BootSector/bs32.S
@@ -35,7 +35,7 @@ Ia32Jump:
   jmp   BootSectorEntryPoint  # JMP inst                  - 3 bytes
   nop
 
-OemId:             .ascii  "INTEL   "    # OemId               - 8 bytes
+OemId:             .ascii  "INTEL   "   # OemId               - 8 bytes
 # BPB data below will be fixed by tool
 SectorSize:        .word  0             # Sector Size         - 16 bits
 SectorsPerCluster: .byte  0             # Sector Per Cluster  - 8 bits
diff --git a/DuetPkg/BootSector/start.S b/DuetPkg/BootSector/start.S
index 4b65ff038e..9d06654108 100644
--- a/DuetPkg/BootSector/start.S
+++ b/DuetPkg/BootSector/start.S
@@ -335,7 +335,7 @@ start:
 MemMapLoop: 
         movl $0xe820, %eax
         movl $20, %ecx
-        movl 0x534d4150, %edx  # SMAP
+        movl $0x534d4150, %edx  # SMAP
         int $0x15
         jc  MemMapDone
         addl $20, %edi
diff --git a/DuetPkg/BootSector/start16.S b/DuetPkg/BootSector/start16.S
index b7c854b02a..de845215d1 100644
--- a/DuetPkg/BootSector/start16.S
+++ b/DuetPkg/BootSector/start16.S
@@ -332,7 +332,7 @@ start:
 MemMapLoop: 
         movl $0xe820, %eax
         movl $20, %ecx
-        movl 0x534d4150, %edx  # 0x534d4150  stands for 'SMAP'
+        movl $0x534d4150, %edx  # 0x534d4150  stands for 'SMAP'
         int $0x15
         jc  MemMapDone
         addl $20, %edi