--- a/test/hotspot/jtreg/runtime/CompressedOops/UseCompressedOops.java	Mon Jan 28 08:58:42 2019 +0100
+++ b/test/hotspot/jtreg/runtime/CompressedOops/UseCompressedOops.java	Mon Jan 28 10:24:23 2019 +0100
@@ -63,7 +63,7 @@
         testCompressedOopsModes(args, "-XX:+UseParallelGC");
         testCompressedOopsModes(args, "-XX:+UseParallelOldGC");
         if (GC.Shenandoah.isSupported()) {
-            testCompressedOopsModes(args, "-XX:+UseShenandoahGC");
+            testCompressedOopsModes(args, "-XX:+UnlockExperimentalVMOptions", "-XX:+UseShenandoahGC");
         }
     }