diff --git a/extra/combinators/lib/lib.factor b/extra/combinators/lib/lib.factor
index e4d66d4725..a24e7bd791 100644
--- a/extra/combinators/lib/lib.factor
+++ b/extra/combinators/lib/lib.factor
@@ -161,3 +161,8 @@ MACRO: map-call-with2 ( quots -- )
   r> length [ narray ] curry append ;
 
 MACRO: map-exec-with ( words -- ) [ 1quotation ] map [ map-call-with ] curry ;
+
+MACRO: construct-slots ( assoc tuple-class -- tuple ) 
+    [ construct-empty ] curry swap [
+        [ dip ] curry swap 1quotation [ keep ] curry compose
+    ] { } assoc>map concat compose ;