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diff --git a/js/src/tests/non262/regress/regress-500528.js b/js/src/tests/non262/regress/regress-500528.js
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+++ b/js/src/tests/non262/regress/regress-500528.js
@@ -0,0 +1,22 @@
+/*
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/licenses/publicdomain/
+ * Contributor: Jason Orendorff
+ */
+
+// This test appeared in bug 497789 comment 78.
+
+var a = {x: 'a'},
+    b1 = Object.create(a),
+    c1 = Object.create(b1),
+    b2 = Object.create(a),
+    c2 = Object.create(b2);
+
+b2.x = 'b';  // foreshadowing a.x
+
+var s = '';
+for (var obj of [c1, c2])
+    s += obj.x;
+assertEq(s, 'ab');
+
+reportCompare(0, 0, "Property cache soundness: objects with the same shape but different prototypes.");