diff --git a/boot/fat.asm b/boot/fat.asm
index aeb8d35..cc1a26d 100644
--- a/boot/fat.asm
+++ b/boot/fat.asm
@@ -54,6 +54,10 @@ fdc:
   db "FAT12"
   times (62 - ($-$$)) db " "
 
+; mformat keeps writing until here
+; if we place init earlier, code gets overwritten
+times (62 - ($-$$)) nop
+
 init:
   cli