diff --git a/test-app/app/src/main/assets/internal/ts_helpers.js b/test-app/app/src/main/assets/internal/ts_helpers.js
index 1a0625f45..d1860dc47 100644
--- a/test-app/app/src/main/assets/internal/ts_helpers.js
+++ b/test-app/app/src/main/assets/internal/ts_helpers.js
@@ -170,6 +170,8 @@
 	Object.defineProperty(global, "__extends", { value: __extends });
 	Object.defineProperty(global, "__decorate", { value: __decorate });
 
-	global.JavaProxy = JavaProxy;
+	if (!global.__ns__worker) {
+		global.JavaProxy = JavaProxy;
+	}
 	global.Interfaces = Interfaces;
 })()
\ No newline at end of file
diff --git a/test-app/app/src/main/java/com/tns/RuntimeHelper.java b/test-app/app/src/main/java/com/tns/RuntimeHelper.java
index 423cc44b1..90a64f16e 100644
--- a/test-app/app/src/main/java/com/tns/RuntimeHelper.java
+++ b/test-app/app/src/main/java/com/tns/RuntimeHelper.java
@@ -190,7 +190,7 @@ public static Runtime initRuntime(Context context) {
                     waitForLiveSync(context);
                 }
 
-                runtime.runScript(new File(appDir, "internal/ts_helpers.js"));
+//                runtime.runScript(new File(appDir, "internal/ts_helpers.js"));
 
                 File javaClassesModule = new File(appDir, "app/tns-java-classes.js");
                 if (javaClassesModule.exists()) {
diff --git a/test-app/runtime/src/main/cpp/Runtime.cpp b/test-app/runtime/src/main/cpp/Runtime.cpp
index 7e542170b..c7264148d 100644
--- a/test-app/runtime/src/main/cpp/Runtime.cpp
+++ b/test-app/runtime/src/main/cpp/Runtime.cpp
@@ -566,6 +566,7 @@ Isolate* Runtime::PrepareV8Runtime(const string& filesPath, const string& native
     else {
         m_isMainThread = false;
         auto postMessageFuncTemplate = FunctionTemplate::New(isolate, CallbackHandlers::WorkerGlobalPostMessageCallback);
+        globalTemplate->Set(ArgConverter::ConvertToV8String(isolate, "__ns__worker"), Boolean::New(isolate, true));
         globalTemplate->Set(ArgConverter::ConvertToV8String(isolate, "postMessage"), postMessageFuncTemplate);
         auto closeFuncTemplate = FunctionTemplate::New(isolate, CallbackHandlers::WorkerGlobalCloseCallback);
         globalTemplate->Set(ArgConverter::ConvertToV8String(isolate, "close"), closeFuncTemplate);
diff --git a/test-app/runtime/src/main/java/com/tns/Runtime.java b/test-app/runtime/src/main/java/com/tns/Runtime.java
index ad8caed91..17670e3dc 100644
--- a/test-app/runtime/src/main/java/com/tns/Runtime.java
+++ b/test-app/runtime/src/main/java/com/tns/Runtime.java
@@ -605,6 +605,7 @@ public static void initWorker(String jsFileName, String callingJsDir, int id) {
     private static Runtime initRuntime(DynamicConfiguration dynamicConfiguration) {
         Runtime runtime = new Runtime(staticConfiguration, dynamicConfiguration);
         runtime.init();
+        runtime.runScript(new File(staticConfiguration.appDir, "internal/ts_helpers.js"));
 
         return runtime;
     }