diff --git a/lib/OpenLayers/BaseTypes/Class.js b/lib/OpenLayers/BaseTypes/Class.js
index 23c7a6278f..a1f3495b54 100644
--- a/lib/OpenLayers/BaseTypes/Class.js
+++ b/lib/OpenLayers/BaseTypes/Class.js
@@ -37,7 +37,7 @@ OpenLayers.Class = function() {
 
     var C = typeof F.initialize == "function" ?
         F.initialize :
-        function(){ P.apply(this, arguments); };
+        function(){ P.prototype.initialize.apply(this, arguments); };
 
     if (len > 1) {
         var newArgs = [C, P].concat(
diff --git a/tests/BaseTypes/Class.html b/tests/BaseTypes/Class.html
index ebbe09249a..2079ce6d5f 100644
--- a/tests/BaseTypes/Class.html
+++ b/tests/BaseTypes/Class.html
@@ -432,27 +432,26 @@
         t.eq(b.a, "bar", "ctor overwritten");
     }
 
-    // This test doesn't currently pass.
-    /*
     function test_overwrite_5(t) {
         // overwrite constructor of parent class, which itself
         // doesn't defined "initialize"
-        t.plan(1);
+        t.plan(2);
         var A = OpenLayers.Class({
             initialize: function() {
                 this.a = "foo";
             }
         });
         var B = OpenLayers.Class(A, {});
+        var _A = A;
         A = overwrite(A, {
             initialize: function() {
                 this.a = "bar";
             }
         });
         var b = new B;
+        t.ok(A.prototype === _A.prototype, "A and _A share the prototype");
         t.eq(b.a, "bar", "ctor overwritten");
     }
-    */
 
     function test_overwrite_6(t) {
         // with static methods