--- a/src/hotspot/share/gc/z/zArguments.cpp	Tue Jul 02 12:24:26 2019 +0200
+++ b/src/hotspot/share/gc/z/zArguments.cpp	Mon Jun 10 13:04:12 2019 +0200
@@ -92,6 +92,11 @@
   // same reason we need fixup_partial_loads
   FLAG_SET_DEFAULT(VerifyBeforeIteration, false);
 
+  if (VerifyBeforeGC || VerifyDuringGC || VerifyAfterGC) {
+    FLAG_SET_DEFAULT(ZVerifyRoots, true);
+    FLAG_SET_DEFAULT(ZVerifyObjects, true);
+  }
+
   // Verification of stacks not (yet) supported, for the same reason
   // we need fixup_partial_loads
   DEBUG_ONLY(FLAG_SET_DEFAULT(VerifyStack, false));