diff --git a/scripts/build/binary_grub-legacy b/scripts/build/binary_grub-legacy
index bfcddb650..bcd78b0e9 100755
--- a/scripts/build/binary_grub-legacy
+++ b/scripts/build/binary_grub-legacy
@@ -150,7 +150,7 @@ case "${LIVE_IMAGE_TYPE}" in
 
 	hdd*|netboot)
 		Echo_warning "Bootloader in this image type not yet supported by live-build."
-		Echo_warning "This would produce a not bootable image, aborting (FIXME)."
+		Echo_error "This would produce a not bootable image, aborting (FIXME)."
 		exit 1
 		;;
 esac
diff --git a/scripts/build/binary_grub-pc b/scripts/build/binary_grub-pc
index ebcbc0acd..b251fb64f 100755
--- a/scripts/build/binary_grub-pc
+++ b/scripts/build/binary_grub-pc
@@ -54,7 +54,7 @@ Install_package
 case "${LIVE_IMAGE_TYPE}" in
 	hdd*|netboot)
 		Echo_warning "Bootloader in this image type not yet supported by live-build."
-		Echo_warning "This would produce a not bootable image, aborting (FIXME)."
+		Echo_error "This would produce a not bootable image, aborting (FIXME)."
 		exit 1
 		;;
 esac