diff --git a/src/index.js b/src/index.js
index 782611d..4edcfd3 100644
--- a/src/index.js
+++ b/src/index.js
@@ -10,11 +10,11 @@ const create = (...args) => Object.freeze(Object.assign(...args))
 
 function constant() { return this }
 function extract() { return this[ValueKey] }
-function extend(f) { return this.lift(f(this)) }
+function extend(f) { return this.of(f(this)) }
 function bind(fn) { return fn(this[ValueKey]) }
 function ap(other) { return other.map(this[ValueKey]) }
 function map(fn) {
-  return this.lift(this.bind(fn))
+  return this.of(this.bind(fn))
 }
 
 function match(pattern) {