diff --git a/runtime/StarlingMonkey b/runtime/StarlingMonkey
index 8b909f0c03..150501f1aa 160000
--- a/runtime/StarlingMonkey
+++ b/runtime/StarlingMonkey
@@ -1 +1 @@
-Subproject commit 8b909f0c03fa63307a3d781efebc0f68f6303e88
+Subproject commit 150501f1aa1f65542ab4047218c4f14ac19f40b5
diff --git a/runtime/fastly/builtins/fastly.cpp b/runtime/fastly/builtins/fastly.cpp
index 3c26b75efa..80effbb2e0 100644
--- a/runtime/fastly/builtins/fastly.cpp
+++ b/runtime/fastly/builtins/fastly.cpp
@@ -414,8 +414,6 @@ bool install(api::Engine *engine) {
   bool ENABLE_EXPERIMENTAL_HIGH_RESOLUTION_TIME_METHODS =
       std::string(std::getenv("ENABLE_EXPERIMENTAL_HIGH_RESOLUTION_TIME_METHODS")) == "1";
 
-  engine->enable_module_mode(std::string(std::getenv("ENABLE_MODULE_MODE")) == "1");
-
   JS::SetOutOfMemoryCallback(engine->cx(), oom_callback, nullptr);
 
   JS::RootedObject fastly(engine->cx(), JS_NewPlainObject(engine->cx()));
diff --git a/src/compileApplicationToWasm.js b/src/compileApplicationToWasm.js
index 01c7e17b61..418002819c 100644
--- a/src/compileApplicationToWasm.js
+++ b/src/compileApplicationToWasm.js
@@ -131,14 +131,13 @@ export async function compileApplicationToWasm(
         ],
         {
           stdio: [null, process.stdout, process.stderr],
-          input: maybeWindowsPath(wizerInput),
+          input: `${maybeWindowsPath(wizerInput)}${enableExperimentalTopLevelAwait ? '' : ' --legacy-script'}`,
           shell: true,
           encoding: 'utf-8',
           env: {
             ...process.env,
             ENABLE_EXPERIMENTAL_HIGH_RESOLUTION_TIME_METHODS:
               enableExperimentalHighResolutionTimeMethods ? '1' : '0',
-            ENABLE_MODULE_MODE: enableExperimentalTopLevelAwait ? '1' : '0',
           },
         },
       );
@@ -161,14 +160,13 @@ export async function compileApplicationToWasm(
         ],
         {
           stdio: [null, process.stdout, process.stderr],
-          input: maybeWindowsPath(wizerInput),
+          input: `${maybeWindowsPath(wizerInput)}${enableExperimentalTopLevelAwait ? '' : ' --legacy-script'}`,
           shell: true,
           encoding: 'utf-8',
           env: {
             ...process.env,
             ENABLE_EXPERIMENTAL_HIGH_RESOLUTION_TIME_METHODS:
               enableExperimentalHighResolutionTimeMethods ? '1' : '0',
-            ENABLE_MODULE_MODE: enableExperimentalTopLevelAwait ? '1' : '0',
           },
         },
       );