diff --git a/lib/js/transpile.sx b/lib/js/transpile.sx
index fbbb452b..619d796f 100644
--- a/lib/js/transpile.sx
+++ b/lib/js/transpile.sx
@@ -1307,11 +1307,20 @@
           (js-sym "let")
           (list (list (js-sym "this") (list (js-sym "js-this"))))
           (list
-            (js-sym "call/cc")
+            (js-sym "let")
             (list
-              (js-sym "fn")
-              (list (js-sym "__return__"))
-              (cons (js-sym "begin") (append inits body-forms)))))))))
+              (list
+                (js-sym "__r__")
+                (list
+                  (js-sym "call/cc")
+                  (list
+                    (js-sym "fn")
+                    (list (js-sym "__return__"))
+                    (cons (js-sym "begin") (append inits body-forms))))))
+            (list
+              (js-sym "if")
+              (list (js-sym "=") (js-sym "__r__") nil)
+              :js-undefined (js-sym "__r__"))))))))
 
 (define
   js-transpile-funcexpr-async