Index: src/pmc/fixedpmcarray.pmc
===================================================================
--- src/pmc/fixedpmcarray.pmc	(revision 40439)
+++ src/pmc/fixedpmcarray.pmc	(working copy)
@@ -44,8 +44,14 @@
     METHOD sort(PMC *cmp_func :optional) {
         const INTVAL n = SELF.elements();
 
-        if (n > 1)
-           Parrot_quicksort(interp, (void **)PMC_array(SELF), n, cmp_func);
+        if (n > 1) {
+           if (PObj_is_object_TEST(SELF)) {
+               PMC *parent = SELF.get_attr_str(CONST_STRING(interp, "proxy"));
+               Parrot_pcc_invoke_method_from_c_args(interp, parent, CONST_STRING(interp, "sort"), "P->", cmp_func);
+           }
+           else
+               Parrot_quicksort(interp, (void **)PMC_array(SELF), n, cmp_func);
+        }
     }
 
 /*