diff --git a/src/boot/efi/console.h b/src/boot/efi/console.h
index 10c5ce4ebd..b9ed6c70b3 100644
--- a/src/boot/efi/console.h
+++ b/src/boot/efi/console.h
@@ -9,7 +9,7 @@
 
 #define EFI_CONTROL_PRESSED             (EFI_RIGHT_CONTROL_PRESSED|EFI_LEFT_CONTROL_PRESSED)
 #define EFI_ALT_PRESSED                 (EFI_RIGHT_ALT_PRESSED|EFI_LEFT_ALT_PRESSED)
-#define KEYPRESS(keys, scan, uni) ((((UINT64)keys) << 32) | ((scan) << 16) | (uni))
+#define KEYPRESS(keys, scan, uni) ((((UINT64)keys) << 32) | (((UINT64)scan) << 16) | (uni))
 #define KEYCHAR(k) ((k) & 0xffff)
 #define CHAR_CTRL(c) ((c) - 'a' + 1)