diff --git a/atlas-core/src/main/java/android/taobao/atlas/framework/Atlas.java b/atlas-core/src/main/java/android/taobao/atlas/framework/Atlas.java
index 0f7aa556f..647eabcde 100644
--- a/atlas-core/src/main/java/android/taobao/atlas/framework/Atlas.java
+++ b/atlas-core/src/main/java/android/taobao/atlas/framework/Atlas.java
@@ -337,9 +337,9 @@ public void init(Application application,boolean reset) throws AssertionArrayExc
 
             Object gDefault = null;
             if(Build.VERSION.SDK_INT<25) {
-                AtlasHacks.ActivityManagerNative_gDefault.get(AtlasHacks.ActivityManagerNative.getmClass());
+                gDefault = AtlasHacks.ActivityManagerNative_gDefault.get(AtlasHacks.ActivityManagerNative.getmClass());
             }else{
-                AtlasHacks.ActivityManagerNative_getDefault.invoke(AtlasHacks.ActivityManagerNative.getmClass());
+                gDefault = AtlasHacks.ActivityManagerNative_getDefault.invoke(AtlasHacks.ActivityManagerNative.getmClass());
             }
             AtlasHacks.Singleton_mInstance.hijack(gDefault, activityManagerProxy);
         }catch(Throwable e){}