diff --git a/src/hotspot/share/gc/shared/cardTable.cpp b/src/hotspot/share/gc/shared/cardTable.cpp
index fdf6dcf3ece..4109db0fe18 100644
--- a/src/hotspot/share/gc/shared/cardTable.cpp
+++ b/src/hotspot/share/gc/shared/cardTable.cpp
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2000, 2023, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2000, 2024, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -68,8 +68,7 @@ CardTable::CardTable(MemRegion whole_heap) :
   _page_size(os::vm_page_size()),
   _byte_map_size(0),
   _byte_map(nullptr),
-  _byte_map_base(nullptr),
-  _guard_region()
+  _byte_map_base(nullptr)
 {
   assert((uintptr_t(_whole_heap.start())  & (_card_size - 1))  == 0, "heap must start at card boundary");
   assert((uintptr_t(_whole_heap.end()) & (_card_size - 1))  == 0, "heap must end at card boundary");
@@ -78,8 +77,7 @@ CardTable::CardTable(MemRegion whole_heap) :
 void CardTable::initialize(void* region0_start, void* region1_start) {
   size_t num_cards = cards_required(_whole_heap.word_size());
 
-  // each card takes 1 byte; + 1 for the guard card
-  size_t num_bytes = num_cards + 1;
+  size_t num_bytes = num_cards * sizeof(CardValue);
   _byte_map_size = compute_byte_map_size(num_bytes);
 
   HeapWord* low_bound  = _whole_heap.start();
@@ -107,10 +105,6 @@ void CardTable::initialize(void* region0_start, void* region1_start) {
   assert(byte_for(low_bound) == &_byte_map[0], "Checking start of map");
   assert(byte_for(high_bound-1) <= &_byte_map[last_valid_index()], "Checking end of map");
 
-  CardValue* guard_card = &_byte_map[num_cards];
-  assert(is_aligned(guard_card, _page_size), "must be on its own OS page");
-  _guard_region = MemRegion((HeapWord*)guard_card, _page_size);
-
   initialize_covered_region(region0_start, region1_start);
 
   log_trace(gc, barrier)("CardTable::CardTable: ");
diff --git a/src/hotspot/share/gc/shared/cardTable.hpp b/src/hotspot/share/gc/shared/cardTable.hpp
index db6f9796ac1..13285be4fc5 100644
--- a/src/hotspot/share/gc/shared/cardTable.hpp
+++ b/src/hotspot/share/gc/shared/cardTable.hpp
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2000, 2023, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2000, 2024, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -59,9 +59,6 @@ protected:
   // The covered regions should be in address order.
   MemRegion _covered[max_covered_regions];
 
-  // The last card is a guard card; never committed.
-  MemRegion _guard_region;
-
   inline size_t compute_byte_map_size(size_t num_bytes);
 
   enum CardValues {
diff --git a/src/hotspot/share/gc/shared/vmStructs_gc.hpp b/src/hotspot/share/gc/shared/vmStructs_gc.hpp
index ae9843c31eb..d932b195695 100644
--- a/src/hotspot/share/gc/shared/vmStructs_gc.hpp
+++ b/src/hotspot/share/gc/shared/vmStructs_gc.hpp
@@ -89,7 +89,6 @@
   nonstatic_field(CardTable,                   _page_size,                                    const size_t)                          \
   nonstatic_field(CardTable,                   _byte_map_size,                                const size_t)                          \
   nonstatic_field(CardTable,                   _byte_map,                                     CardTable::CardValue*)                 \
-  nonstatic_field(CardTable,                   _guard_region,                                 MemRegion)                             \
   nonstatic_field(CardTable,                   _byte_map_base,                                CardTable::CardValue*)                 \
   nonstatic_field(CardTableBarrierSet,         _defer_initial_card_mark,                      bool)                                  \
   nonstatic_field(CardTableBarrierSet,         _card_table,                                   CardTable*)                            \