diff --git a/extra/alien/data/map/map.factor b/extra/alien/data/map/map.factor
index 466ffe633c..d3634e7b71 100644
--- a/extra/alien/data/map/map.factor
+++ b/extra/alien/data/map/map.factor
@@ -85,8 +85,7 @@ MACRO: unpack-params ( ins -- quot )
     [ c-type-count nip '[ _ firstn-unsafe ] ] map '[ _ spread ] ;
 
 MACRO: pack-params ( outs -- quot )
-    [ ] [ c-type-count nip dup
-    [ [ ndip POSTPONE: _ ] dip set-firstn ] 3curry ] reduce
+    [ ] [ c-type-count nip dup [ [ ndip _ ] dip set-firstn ] 3curry ] reduce
     fry [ call ] compose ;
 
 :: [data-map] ( ins outs param-quot -- quot )