--- a/js/src/tests/js1_5/extensions/jstests.list
+++ b/js/src/tests/js1_5/extensions/jstests.list
@@ -139,17 +139,17 @@ script regress-367501-04.js
 skip-if(xulRuntime.OS=="WINNT"&&isDebugBuild) script regress-367589.js # slow 
 script regress-367630.js
 script regress-367923.js
 script regress-368859.js
 script regress-369404.js
 script regress-369696-01.js
 script regress-369696-02.js
 script regress-369696-03.js
-script regress-371636.js
+random-if(xulRuntime.OS=="WINNT"&&isDebugBuild) script regress-371636.js # bug 528284
 script regress-372309.js
 script regress-374589.js
 script regress-375183.js
 script regress-375344.js
 script regress-375801.js
 script regress-376052.js
 script regress-379523.js
 script regress-380581.js