--- old/test/hotspot/jtreg/gc/shenandoah/options/TestHeuristicsUnlock.java	2020-04-06 16:01:06.149778608 +0200
+++ new/test/hotspot/jtreg/gc/shenandoah/options/TestHeuristicsUnlock.java	2020-04-06 16:01:06.039778679 +0200
@@ -49,7 +49,7 @@
         testWith("-XX:ShenandoahGCHeuristics=static", Mode.PRODUCT);
         testWith("-XX:ShenandoahGCHeuristics=compact", Mode.PRODUCT);
 
-        testWith("-XX:ShenandoahGCMode=iu", Mode.PRODUCT);
+        testWith("-XX:ShenandoahGCMode=iu", Mode.EXPERIMENTAL);
 
         testWith("-XX:ShenandoahGCHeuristics=aggressive", Mode.DIAGNOSTIC);
         testWith("-XX:ShenandoahGCHeuristics=passive", Mode.DIAGNOSTIC);