--- a/js/src/builtin/ParallelArray.cpp
+++ b/js/src/builtin/ParallelArray.cpp
@@ -1602,17 +1602,17 @@ ParallelArrayObject::get(JSContext *cx, 
     return obj->getParallelArrayElement(cx, iv, args.rval());
 }
 
 bool
 ParallelArrayObject::dimensionsGetter(JSContext *cx, CallArgs args)
 {
     RootedObject dimArray(cx, as(&args.thisv().toObject())->dimensionArray());
     RootedObject copy(cx, NewDenseCopiedArray(cx, dimArray->getDenseInitializedLength(),
-                                              dimArray->getDenseElements()));
+                                              dimArray, 0));
     if (!copy)
         return false;
     // Reuse the existing dimension array's type.
     copy->setType(dimArray->type());
     args.rval().setObject(*copy);
     return true;
 }