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-rw-r--r--DuetPkg/BootSector/start.S2
1 files changed, 1 insertions, 1 deletions
diff --git a/DuetPkg/BootSector/start.S b/DuetPkg/BootSector/start.S
index fe7aa1b4d5..86aa4b7543 100644
--- a/DuetPkg/BootSector/start.S
+++ b/DuetPkg/BootSector/start.S
@@ -73,7 +73,7 @@ BootSectorEntryPoint:
NoVarStore:
pushw %es
# Set the 5th byte start @ 0:19000 to non-zero indicating we should init var store header in DxeIpl
- movb %al, %es:4
+ movb %al, %es:(4)
jmp SaveVolumeId
CheckVarStoreSize: