diff --git a/firmware/lib/vboot_api_kernel.c b/firmware/lib/vboot_api_kernel.c
index a35fd31..ffcb75c 100644
--- a/firmware/lib/vboot_api_kernel.c
+++ b/firmware/lib/vboot_api_kernel.c
@@ -105,6 +105,8 @@
   return retval;
 }
 
+#define CONFIRM_KEY_DELAY 20  /* Check confirm screen keys every 20ms */
+
 /* Ask the user to confirm something. We should display whatever the question
  * is first, then call this. ESC is always "no", ENTER is always "yes", and
  * we'll specify what SPACE means. We don't return until one of those keys is
@@ -139,7 +141,7 @@
     default:
       VbCheckDisplayKey(cparams, key, &vnc);
     }
-    VbExSleepMs(1000);
+    VbExSleepMs(CONFIRM_KEY_DELAY);
   }
   /* not reached, but compiler will complain without it */
   return -1;