diff --git a/BUILD.gn b/BUILD.gn
index ff1944f584..6b63f053fa 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -333,7 +333,7 @@ if (v8_enable_snapshot_native_code_counters == "") {
 }
 if (v8_enable_pointer_compression == "") {
   v8_enable_pointer_compression =
-      (v8_current_cpu == "arm64" || v8_current_cpu == "x64")
+      v8_current_cpu == "arm64" || v8_current_cpu == "x64"
 }
 if (v8_enable_pointer_compression_shared_cage == "") {
   v8_enable_pointer_compression_shared_cage = false
@@ -1918,6 +1918,7 @@ action("v8_dump_build_config") {
     "v8_enable_pointer_compression=$v8_enable_pointer_compression",
     "v8_enable_pointer_compression_shared_cage=" +
         "$v8_enable_pointer_compression_shared_cage",
+    "v8_enable_third_party_heap=$v8_enable_third_party_heap",
     "v8_enable_webassembly=$v8_enable_webassembly",
     "v8_control_flow_integrity=$v8_control_flow_integrity",
     "v8_target_cpu=\"$v8_target_cpu\"",
diff --git a/tools/testrunner/base_runner.py b/tools/testrunner/base_runner.py
index 9d059fe0e9..34d5421f82 100644
--- a/tools/testrunner/base_runner.py
+++ b/tools/testrunner/base_runner.py
@@ -190,6 +190,7 @@ class BuildConfig(object):
     self.lite_mode = build_config['v8_enable_lite_mode']
     self.pointer_compression = build_config['v8_enable_pointer_compression']
     self.pointer_compression_shared_cage = build_config['v8_enable_pointer_compression_shared_cage']
+    self.third_party_heap = build_config['v8_enable_third_party_heap']
     self.webassembly = build_config['v8_enable_webassembly']
     # Export only for MIPS target
     if self.arch in ['mips', 'mipsel', 'mips64', 'mips64el']:
@@ -232,6 +233,8 @@ class BuildConfig(object):
       detected_options.append('pointer_compression')
     if self.pointer_compression_shared_cage:
       detected_options.append('pointer_compression_shared_cage')
+    if self.third_party_heap:
+      detected_options.append('third_party_heap')
     if self.webassembly:
       detected_options.append('webassembly')
 
@@ -684,6 +687,7 @@ class BaseTestRunner(object):
       "simulator_run": self.build_config.simulator_run and
                        not options.dont_skip_simulator_slow_tests,
       "system": self.target_os,
+      "third_party_heap": self.build_config.third_party_heap,
       "tsan": self.build_config.tsan,
       "ubsan_vptr": self.build_config.ubsan_vptr,
       "verify_csa": self.build_config.verify_csa,
diff --git a/tools/unittests/testdata/testroot1/v8_build_config.json b/tools/unittests/testdata/testroot1/v8_build_config.json
index bd027dc898..9bf6bd1ee4 100644
--- a/tools/unittests/testdata/testroot1/v8_build_config.json
+++ b/tools/unittests/testdata/testroot1/v8_build_config.json
@@ -23,5 +23,6 @@
   "v8_enable_pointer_compression": true,
   "v8_enable_pointer_compression_shared_cage": true,
   "v8_control_flow_integrity": false,
+  "v8_enable_third_party_heap": false,
   "v8_enable_webassembly": true
 }
diff --git a/tools/unittests/testdata/testroot2/v8_build_config.json b/tools/unittests/testdata/testroot2/v8_build_config.json
index 36a76b6824..50517b3dc8 100644
--- a/tools/unittests/testdata/testroot2/v8_build_config.json
+++ b/tools/unittests/testdata/testroot2/v8_build_config.json
@@ -23,5 +23,6 @@
   "v8_enable_pointer_compression": false,
   "v8_enable_pointer_compression_shared_cage": false,
   "v8_control_flow_integrity": false,
+  "v8_enable_third_party_heap": false,
   "v8_enable_webassembly": true
 }