diff --git a/teavm-classlib/src/main/java/org/teavm/classlib/java/lang/TThread.java b/teavm-classlib/src/main/java/org/teavm/classlib/java/lang/TThread.java
index 578444e65..5a66d1575 100644
--- a/teavm-classlib/src/main/java/org/teavm/classlib/java/lang/TThread.java
+++ b/teavm-classlib/src/main/java/org/teavm/classlib/java/lang/TThread.java
@@ -19,6 +19,7 @@ import org.teavm.dom.browser.TimerHandler;
 import org.teavm.dom.browser.Window;
 import org.teavm.javascript.spi.Async;
 import org.teavm.jso.JS;
+import org.teavm.platform.Platform;
 import org.teavm.platform.async.AsyncCallback;
 
 
@@ -56,22 +57,19 @@ public class TThread extends TObject implements TRunnable {
     }
 
     public void start(){
-        window.setTimeout(new TimerHandler() {
-            @Override public void onTimer() {
-                launch(TThread.this);
+        Platform.startThread(new Runnable() {
+            @Override
+            public void run() {
+                try {
+                    activeCount++;
+                    setCurrentThread(TThread.this);
+                    target.run();
+                } finally {
+                    activeCount--;
+                    setCurrentThread(mainThread);
+                }
             }
-        }, 0);
-    }
-
-    private static void launch(TThread thread) {
-        try {
-            activeCount++;
-            setCurrentThread(thread);
-            thread.run();
-        } finally {
-            activeCount--;
-            setCurrentThread(mainThread);
-        }
+        });
     }
 
     static void setCurrentThread(TThread thread){
diff --git a/teavm-platform/src/main/java/org/teavm/platform/Platform.java b/teavm-platform/src/main/java/org/teavm/platform/Platform.java
index 38c43fcfd..8e9976669 100644
--- a/teavm-platform/src/main/java/org/teavm/platform/Platform.java
+++ b/teavm-platform/src/main/java/org/teavm/platform/Platform.java
@@ -92,6 +92,14 @@ public final class Platform {
     @PluggableDependency(PlatformGenerator.class)
     public static native Enum<?>[] getEnumConstants(PlatformClass cls);
 
+    @GeneratedBy(PlatformGenerator.class)
+    @PluggableDependency(PlatformGenerator.class)
+    public static native void startThread(Runnable runnable);
+
+    private static void launchThread(Runnable runnable) {
+        runnable.run();
+    }
+
     public static PlatformString stringFromCharCode(int charCode) {
         return ((PlatformHelper)JS.getGlobal()).getStringClass().fromCharCode(charCode);
     }
diff --git a/teavm-platform/src/main/java/org/teavm/platform/plugin/AsyncMethodGenerator.java b/teavm-platform/src/main/java/org/teavm/platform/plugin/AsyncMethodGenerator.java
index 2dfbc2878..68ae8a10a 100644
--- a/teavm-platform/src/main/java/org/teavm/platform/plugin/AsyncMethodGenerator.java
+++ b/teavm-platform/src/main/java/org/teavm/platform/plugin/AsyncMethodGenerator.java
@@ -38,7 +38,7 @@ public class AsyncMethodGenerator implements Generator, DependencyPlugin {
     @Override
     public void generate(GeneratorContext context, SourceWriter writer, MethodReference methodRef) throws IOException {
         MethodReference asyncRef = getAsyncReference(methodRef);
-        writer.append("var callback").ws().append("=").ws().append("function()").ws().append("{}").softNewLine();
+        writer.append("var callback").ws().append("=").ws().append("function()").ws().append("{};").softNewLine();
         writer.append("callback.").appendMethod(completeMethod).ws().append("=").ws().append("function($this,").ws()
                 .append("val)").ws().append("{").indent().softNewLine();
         writer.append("return $return($rt_asyncResult(val));").softNewLine();
diff --git a/teavm-platform/src/main/java/org/teavm/platform/plugin/PlatformGenerator.java b/teavm-platform/src/main/java/org/teavm/platform/plugin/PlatformGenerator.java
index ac744de90..808e304bb 100644
--- a/teavm-platform/src/main/java/org/teavm/platform/plugin/PlatformGenerator.java
+++ b/teavm-platform/src/main/java/org/teavm/platform/plugin/PlatformGenerator.java
@@ -25,6 +25,7 @@ import org.teavm.javascript.spi.GeneratorContext;
 import org.teavm.javascript.spi.Injector;
 import org.teavm.javascript.spi.InjectorContext;
 import org.teavm.model.*;
+import org.teavm.platform.Platform;
 
 /**
  *
@@ -40,6 +41,13 @@ public class PlatformGenerator implements Generator, Injector, DependencyPlugin
             case "clone":
                 method.getVariable(1).connect(method.getResult());
                 break;
+            case "startThread": {
+                MethodDependency launchMethod = agent.linkMethod(new MethodReference(Platform.class,
+                        "launchThread", Runnable.class, void.class), null);
+                method.getVariable(1).connect(launchMethod.getVariable(1));
+                launchMethod.use();
+                break;
+            }
         }
     }
 
@@ -69,6 +77,9 @@ public class PlatformGenerator implements Generator, Injector, DependencyPlugin
             case "clone":
                 generateClone(context, writer);
                 break;
+            case "startThread":
+                generateStartThread(context, writer);
+                break;
         }
     }
 
@@ -117,4 +128,12 @@ public class PlatformGenerator implements Generator, Injector, DependencyPlugin
                 .softNewLine().outdent().append("}").softNewLine();
         writer.append("return copy;").softNewLine();
     }
+
+    private void generateStartThread(GeneratorContext context, SourceWriter writer) throws IOException {
+        String runnable = context.getParameterName(1);
+        writer.append("window.setTimeout(function()").ws().append("{").indent().softNewLine();
+        writer.appendMethodBody(Platform.class, "launchThread", Runnable.class, void.class).append("(")
+                .append(runnable).append(");").softNewLine();
+        writer.outdent().append("},").ws().append("0);").softNewLine();
+    }
 }