--- old/test/hotspot/jtreg/gc/whitebox/TestWBGC.java	2018-06-08 19:43:33.568491289 +0200
+++ new/test/hotspot/jtreg/gc/whitebox/TestWBGC.java	2018-06-08 19:43:33.303479791 +0200
@@ -25,6 +25,7 @@
  * @test TestWBGC
  * @bug 8055098
  * @summary Test verify that WB methods isObjectInOldGen and youngGC works correctly.
+ * @requires vm.gc != "Z"
  * @library /test/lib
  * @modules java.base/jdk.internal.misc
  *          java.management