diff --git a/boot.lua b/boot.lua
index 2fdb73a..fd46a9d 100644
--- a/boot.lua
+++ b/boot.lua
@@ -29,7 +29,7 @@ if data == '' then
 	bootfs = unique(bootfs, nil, 'bootable filesystem')
 else
 	local ty, err = ct(data)
-	if not ty then bail('bootfs %s absent', data)
+	if not ty then bail('bootfs %s absent', data) end
 	if ty ~= 'filesystem' then bail('bootfs %s is a %s', data, ty) end
 	bootfs = data
 end