diff --git a/linux-bootstrap-1.md b/linux-bootstrap-1.md
index b8d83c4..275ca5f 100644
--- a/linux-bootstrap-1.md
+++ b/linux-bootstrap-1.md
@@ -109,9 +109,9 @@ boot:
     mov ah, 0x0e
     mov bh, 0x00
     mov bl, 0x07
-    mov al, !
+    mov al, '!'
 
-	int 0x10
+    int 0x10
     jmp $
 
 times 510-($-$$) db 0