1 files changed, 3 insertions, 1 deletions
diff --git a/copybs.asm b/copybs.asm
index 784096eb..f6905fe1 100644
--- a/copybs.asm
+++ b/copybs.asm
@@ -167,7 +167,7 @@ got_cmdline:
 		and al,al
 		jnz filesystem_error
 
-		mov ax,[bx+dpbSectorSize]
+		mov dx,[bx+dpbSectorSize]	; Save sector size
 ;
 ; Read the boot sector.
 ;
@@ -184,6 +184,8 @@ read_bootsect:
 		mov ax,cs			; Set DS <- CS
 		mov ds,ax
 
+		mov [SectorSize],dx		; Saved sector size from above
+
 		cmp word [DOSVersion],0400h	; DOS 4.00 has a new interface
 		jae .new
 .old: