diff --git a/util/grub.d/00_header.in b/util/grub.d/00_header.in
index 93a90233e..8d46fc973 100644
--- a/util/grub.d/00_header.in
+++ b/util/grub.d/00_header.in
@@ -221,7 +221,7 @@ case x${GRUB_TERMINAL_OUTPUT} in
   ;;
   x*)
     cat << EOF
-terminal_output ${GRUB_TERMINAL_OUTPUT}
+terminal_output --append ${GRUB_TERMINAL_OUTPUT}
 EOF
   ;;
 esac