diff --git a/DuetPkg/CpuIoDxe/x64/CpuIoAccess.asm b/DuetPkg/CpuIoDxe/X64/CpuIoAccess.asm
similarity index 100%
rename from DuetPkg/CpuIoDxe/x64/CpuIoAccess.asm
rename to DuetPkg/CpuIoDxe/X64/CpuIoAccess.asm