diff --git a/grub-core/term/at_keyboard.c b/grub-core/term/at_keyboard.c
index f0a986eb1..597111077 100644
--- a/grub-core/term/at_keyboard.c
+++ b/grub-core/term/at_keyboard.c
@@ -234,7 +234,7 @@ grub_at_keyboard_getkey (struct grub_term_input *term __attribute__ ((unused)))
     return GRUB_TERM_NO_KEY;
 
   if (! KEYBOARD_ISREADY (grub_inb (KEYBOARD_REG_STATUS)))
-    return -1;
+    return GRUB_TERM_NO_KEY;
   at_key = grub_inb (KEYBOARD_REG_DATA);
   old_led = ps2_state.led_status;