diff a/src/hotspot/share/gc/z/zLiveMap.cpp b/src/hotspot/share/gc/z/zLiveMap.cpp
--- a/src/hotspot/share/gc/z/zLiveMap.cpp
+++ b/src/hotspot/share/gc/z/zLiveMap.cpp
@@ -38,10 +38,11 @@
   : _segment_size((object_max_count == 1 ? 1u : (object_max_count / NumSegments)) * BitsPerObject),
     _segment_shift(log2i_exact(_segment_size)),
     _seqnum(0),
     _live_objects(0),
     _live_bytes(0),
+    _will_expand_objects(0),
     _segment_live_bits(0),
     _segment_claim_bits(0),
     _bitmap(0) {}
 
 void ZLiveMap::initialize_bitmap() {
@@ -69,10 +70,11 @@
         // This thread claimed the initialization
 
         // Reset marking information
         _live_bytes.store_relaxed(0u);
         _live_objects.store_relaxed(0u);
+        _will_expand_objects.store_relaxed(0u);
 
         // Clear segment claimed/live bits
         segment_live_bits().clear();
         segment_claim_bits().clear();