diff --git a/src/function.js b/src/function.js
index c00f94f..dce85c7 100644
--- a/src/function.js
+++ b/src/function.js
@@ -135,7 +135,7 @@ export const chain = curry(dispatch(['fantasy-land/chain', 'chain'],
 ))
 
 export const map = curry(dispatch(['fantasy-land/map', 'map'],
-  (f, a) => a.map(f)
+  (f, a) => chain(f, a)
 ))
 
 export const reduce = curry(dispatch(['fantasy-land/reduce', 'reduce'],