diff --git a/boot/fat.asm b/boot/fat.asm
index 85dabf5..96e1317 100644
--- a/boot/fat.asm
+++ b/boot/fat.asm
@@ -25,6 +25,7 @@ init:		xor ax, ax
 		mov ss, ax
 		mov sp, stack
 		push sp
+		push dx
 
 		; save potential partition table entry
 		push ds
@@ -192,9 +193,9 @@ loadclus:	lodsw
 		call read
 		jmp loadclus
 
-.jump:		mov dl, [bp+bpb.drivenum]
-		pop si
+.jump:		pop si
 		pop ds
+		pop dx
 		ret
 
 err_not_found: