diff --git a/boot/kernel.asm b/boot/kernel.asm
index ed565ed..fd056b3 100644
--- a/boot/kernel.asm
+++ b/boot/kernel.asm
@@ -94,6 +94,8 @@ conine:	mov ah, 1
 	ret
 .has:	xor ax, ax
 	int 0x16
+	test al, al
+	jz conine
 	int 0x29
 	test ax, ax
 	ret
@@ -108,6 +110,8 @@ conin:	mov ah, 1
 	ret
 .has:	xor ax, ax
 	int 0x16
+	test al, al
+	jz conin
 	test ax, ax
 	ret