diff --git a/syndicate/skeleton.rkt b/syndicate/skeleton.rkt
index aad57f9..0dc4516 100644
--- a/syndicate/skeleton.rkt
+++ b/syndicate/skeleton.rkt
@@ -221,9 +221,10 @@
                      (define proj-handler (hash-ref key-proj-handler constants #f))
                      (when proj-handler
                        (modify-skconst! proj-handler term0)
-                       (for [((variable-proj acc) (in-hash (skeleton-matched-constant-table proj-handler)))]
-                         (define variables (apply-projection term0 variable-proj))
-                         (modify-skacc! acc variables term0)))))
+                       (hash-for-each (skeleton-matched-constant-table proj-handler)
+                                      (lambda (variable-proj acc)
+                                        (define variables (apply-projection term0 variable-proj))
+                                        (modify-skacc! acc variables term0))))))
 
     (for [(edge (in-list edges))]
       (match-define (cons (skeleton-selector pop-count index) table) edge)