diff --git a/autojs/src/main/java/com/stardust/autojs/ScriptEngineService.java b/autojs/src/main/java/com/stardust/autojs/ScriptEngineService.java
index 756bfc7a..3e3fe589 100644
--- a/autojs/src/main/java/com/stardust/autojs/ScriptEngineService.java
+++ b/autojs/src/main/java/com/stardust/autojs/ScriptEngineService.java
@@ -123,22 +123,19 @@ public class ScriptEngineService {
             task.setExecutionListener(mScriptExecutionObserver);
         }
         ScriptSource source = task.getSource();
-        if (source instanceof JavaScriptSource && isUiMode((JavaScriptSource) source)) {
-            return ScriptExecuteActivity.execute(mContext, mScriptEngineManager, task);
-        } else {
-            RunnableScriptExecution r = new RunnableScriptExecution(mScriptEngineManager, task);
-            if (task.getConfig().runInNewThread) {
-                new ThreadCompat(r).start();
-            } else {
-                r.run();
+        if (source instanceof JavaScriptSource) {
+            int mode = ((JavaScriptSource) source).getExecutionMode();
+            if ((mode & JavaScriptSource.EXECUTION_MODE_UI) != 0) {
+                return ScriptExecuteActivity.execute(mContext, mScriptEngineManager, task);
             }
-            return r;
         }
-    }
-
-    private boolean isUiMode(JavaScriptSource source) {
-        int mode = source.getExecutionMode();
-        return (mode & JavaScriptSource.EXECUTION_MODE_UI) != 0;
+        RunnableScriptExecution r = new RunnableScriptExecution(mScriptEngineManager, task);
+        if (task.getConfig().runInNewThread) {
+            new ThreadCompat(r).start();
+        } else {
+            r.run();
+        }
+        return r;
     }
 
     public ScriptExecution execute(ScriptSource source, ScriptExecutionListener listener, ExecutionConfig config) {
diff --git a/autojs/src/main/java/com/stardust/autojs/engine/JavaScriptEngine.java b/autojs/src/main/java/com/stardust/autojs/engine/JavaScriptEngine.java
index c1f5c811..894c01f0 100644
--- a/autojs/src/main/java/com/stardust/autojs/engine/JavaScriptEngine.java
+++ b/autojs/src/main/java/com/stardust/autojs/engine/JavaScriptEngine.java
@@ -1,5 +1,7 @@
 package com.stardust.autojs.engine;
 
+import android.support.annotation.CallSuper;
+
 import com.stardust.autojs.execution.ScriptExecution;
 import com.stardust.autojs.runtime.ScriptRuntime;
 import com.stardust.autojs.script.JavaScriptSource;
@@ -11,6 +13,15 @@ import com.stardust.autojs.script.JavaScriptSource;
 public abstract class JavaScriptEngine extends ScriptEngine.AbstractScriptEngine<JavaScriptSource> {
     private ScriptRuntime mRuntime;
 
+    @Override
+    public Object execute(JavaScriptSource scriptSource) {
+        if ((scriptSource.getExecutionMode() & JavaScriptSource.EXECUTION_MODE_AUTO) != 0) {
+            getRuntime().ensureAccessibilityServiceEnabled();
+        }
+        return doExecution(scriptSource);
+    }
+
+    protected abstract Object doExecution(JavaScriptSource scriptSource);
 
     public ScriptRuntime getRuntime() {
         return mRuntime;
diff --git a/autojs/src/main/java/com/stardust/autojs/engine/RhinoJavaScriptEngine.java b/autojs/src/main/java/com/stardust/autojs/engine/RhinoJavaScriptEngine.java
index 4218c059..d339d3ee 100644
--- a/autojs/src/main/java/com/stardust/autojs/engine/RhinoJavaScriptEngine.java
+++ b/autojs/src/main/java/com/stardust/autojs/engine/RhinoJavaScriptEngine.java
@@ -55,7 +55,7 @@ public class RhinoJavaScriptEngine extends JavaScriptEngine {
     }
 
     @Override
-    public Object execute(JavaScriptSource source) {
+    public Object doExecution(JavaScriptSource source) {
         Reader reader = source.getNonNullScriptReader();
         try {
             reader = preprocess(reader);