Clojure defmacro loses metadata

I am trying to create a little Clojure macro that defs a String with a type hint:

(defmacro def-string [name value]
  `(def ^String ~name ~value))

(def-string db-host-option "db-host")

When I macroexpand it, the type hint is lost:

(macroexpand '(def-string db-host-option "db-host"))
;=> (def db-host-option "db-host")

Never mind the wisdom of type hinting this.

Why is the macro losing the metadata? How do I write this macro, or any that includes metadata?