Clojurescript defprotocol and defrecord in different namespaces

This works fine:

(ns ns1) (defprotocol P (foo [this a])) (defrecord Foo [attr] P (foo [this a] a)) (println (foo (Foo. "test") "Works!")) 

But when I move the protocol to its own namespace like so:

(ns ns2) (defprotocol P (foo [this a])) 

Then this throws a Use of undeclared var ns1/foo

(ns ns1 (:require ns2 :refer [P])) (defrecord Foo [attr] P (foo [this a] a)) (println (foo (Foo. "test") "Undeclared var?")) 

I found this really nice write up that makes sense for Clojure and Java.

Is it possible to get my example above to work in clojurescript?

Update: I knew I was missing something super simple! For the record, as mentioned in the accepted answer: all I needed was to refer foo like so:

(ns ns1 (:require ns2 :refer [P foo])) (defrecord Foo [attr] P (foo [this a] a)) (println (foo (Foo. "test") "Works once again"))