diff --git a/BUILD.gn b/BUILD.gn
index cd23d3401b..13cdc6cd9f 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -40,11 +40,6 @@ declare_args() {
   # Sets -DV8_ENABLE_FUTURE.
   v8_enable_future = false
 
-  # Lite mode disables a number of performance optimizations to reduce memory
-  # at the cost of performance.
-  # Sets --DV8_LITE_MODE.
-  v8_enable_lite_mode = false
-
   # Sets -DSYSTEM_INSTRUMENTATION. Enables OS-dependent event tracing
   v8_enable_system_instrumentation = false
 
@@ -771,7 +766,7 @@ config("features") {
   if (v8_etw_guid != "") {
     defines += [ "V8_ETW_GUID=\"$v8_etw_guid\"" ]
   }
-  if (v8_enable_webassembly && !v8_enable_lite_mode) {
+  if (v8_enable_webassembly) {
     defines += [ "V8_ENABLE_WEBASSEMBLY" ]
   }
   if (v8_dict_property_const_tracking) {
diff --git a/gni/v8.gni b/gni/v8.gni
index dc4de9a519..9325baf996 100644
--- a/gni/v8.gni
+++ b/gni/v8.gni
@@ -64,11 +64,16 @@ declare_args() {
   # Enable WebAssembly debugging via GDB-remote protocol.
   v8_enable_wasm_gdb_remote_debugging = false
 
+  # Lite mode disables a number of performance optimizations to reduce memory
+  # at the cost of performance.
+  # Sets -DV8_LITE_MODE.
+  v8_enable_lite_mode = false
+
   # Include support for WebAssembly. If disabled, the 'WebAssembly' global
   # will not be available, and embedder APIs to generate WebAssembly modules
   # will fail. Also, asm.js will not be translated to WebAssembly and will be
   # executed as standard JavaScript instead.
-  v8_enable_webassembly = true
+  v8_enable_webassembly = ""
 
   # Add fuzzilli fuzzer support.
   v8_fuzzilli = false
@@ -104,6 +109,13 @@ if (build_with_chromium && use_perfetto_client_library) {
   v8_use_perfetto = true
 }
 
+# WebAssembly is enabled by default, except in lite mode.
+if (v8_enable_webassembly == "") {
+  v8_enable_webassembly = !v8_enable_lite_mode
+}
+assert(!(v8_enable_webassembly && v8_enable_lite_mode),
+       "Webassembly is not available in lite mode.")
+
 # Points to // in v8 stand-alone or to //v8/ in chromium. We need absolute
 # paths for all configs in templates as they are shared in different
 # subdirectories.
diff --git a/tools/testrunner/base_runner.py b/tools/testrunner/base_runner.py
index 3fd54b9279..c040912fc9 100644
--- a/tools/testrunner/base_runner.py
+++ b/tools/testrunner/base_runner.py
@@ -646,9 +646,6 @@ class BaseTestRunner(object):
                                            '--noenable-sse4-1',
                                            '--no-enable-sse4_1'])
 
-    has_webassembly = self.build_config.webassembly and \
-        not self.build_config.lite_mode
-
     # Set no_simd_sse on architectures without Simd enabled.
     if self.build_config.arch == 'ppc64':
        no_simd_sse = True
@@ -666,7 +663,7 @@ class BaseTestRunner(object):
       "gc_fuzzer": False,
       "gc_stress": False,
       "gcov_coverage": self.build_config.gcov_coverage,
-      "has_webassembly": has_webassembly,
+      "has_webassembly": self.build_config.webassembly,
       "isolates": options.isolates,
       "is_clang": self.build_config.is_clang,
       "is_full_debug": self.build_config.is_full_debug,