diff --git a/BUILD.gn b/BUILD.gn
index 548c2bb156..c918081b31 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -370,6 +370,10 @@ declare_args() {
   # TODO(victorgomes): Remove this flag once Chormium no longer needs
   # the deprecated feature.
   v8_fuchsia_use_vmex_resource = is_fuchsia && !build_with_chromium
+
+  # Enables pointer compression for 8GB heaps.
+  # Sets -DV8_COMPRESS_POINTERS_8GB.
+  v8_enable_pointer_compression_8gb = ""
 }
 
 # Derived defaults.
@@ -418,6 +422,9 @@ if (v8_enable_pointer_compression == "") {
 if (v8_enable_pointer_compression_shared_cage == "") {
   v8_enable_pointer_compression_shared_cage = v8_enable_pointer_compression
 }
+if (v8_enable_pointer_compression_8gb == "") {
+  v8_enable_pointer_compression_8gb = false
+}
 if (v8_enable_fast_torque == "") {
   v8_enable_fast_torque = v8_enable_fast_mksnapshot
 }
@@ -539,6 +546,9 @@ assert(!v8_enable_map_packing || v8_current_cpu == "x64",
 assert(!v8_enable_external_code_space || v8_enable_pointer_compression,
        "External code space feature requires pointer compression")
 
+assert(!v8_enable_pointer_compression_8gb || v8_enable_pointer_compression,
+       "Pointer compression for 8GB cages requires pointer compression")
+
 assert(!v8_enable_sandbox || v8_enable_pointer_compression_shared_cage,
        "The sandbox requires the shared pointer compression cage")
 
@@ -1036,6 +1046,9 @@ config("features") {
   if (v8_expose_memory_corruption_api) {
     defines += [ "V8_EXPOSE_MEMORY_CORRUPTION_API" ]
   }
+  if (v8_enable_pointer_compression_8gb) {
+    defines += [ "V8_COMPRESS_POINTERS_8GB" ]
+  }
 }
 
 config("toolchain") {
diff --git a/src/common/globals.h b/src/common/globals.h
index 1c70a83103..994b972704 100644
--- a/src/common/globals.h
+++ b/src/common/globals.h
@@ -397,6 +397,13 @@ constexpr int kPointerSizeLog2 = kSystemPointerSizeLog2;
 static_assert(kPointerSize == (1 << kPointerSizeLog2));
 #endif
 
+#ifdef V8_COMPRESS_POINTERS_8GB
+// To support 8GB heaps, all alocations are aligned to at least 8 bytes.
+#define V8_COMPRESS_POINTERS_8GB_BOOL true
+#else
+#define V8_COMPRESS_POINTERS_8GB_BOOL false
+#endif
+
 // This type defines raw storage type for external (or off-V8 heap) pointers
 // stored on V8 heap.
 constexpr int kExternalPointerSlotSize = sizeof(ExternalPointer_t);