diff --git a/libs/binder/include/binder/IInterface.h b/libs/binder/include/binder/IInterface.h
index 227d0ae..b61278a 100644
--- a/libs/binder/include/binder/IInterface.h
+++ b/libs/binder/include/binder/IInterface.h
@@ -72,12 +72,18 @@
 // ----------------------------------------------------------------------
 
 #define DECLARE_META_INTERFACE(INTERFACE)                               \
+public:                                                                 \
     static const ::android::String16 descriptor;                        \
     static ::android::sp<I##INTERFACE> asInterface(                     \
             const ::android::sp<::android::IBinder>& obj);              \
     virtual const ::android::String16& getInterfaceDescriptor() const;  \
     I##INTERFACE();                                                     \
     virtual ~I##INTERFACE();                                            \
+    static bool setDefaultImpl(std::unique_ptr<I##INTERFACE> impl);     \
+    static const std::unique_ptr<I##INTERFACE>& getDefaultImpl();       \
+private:                                                                \
+    static std::unique_ptr<I##INTERFACE> default_impl;                  \
+public:                                                                 \
 
 
 #define IMPLEMENT_META_INTERFACE(INTERFACE, NAME)                       \
@@ -100,6 +106,19 @@
         }                                                               \
         return intr;                                                    \
     }                                                                   \
+    std::unique_ptr<I##INTERFACE> I##INTERFACE::default_impl;           \
+    bool I##INTERFACE::setDefaultImpl(std::unique_ptr<I##INTERFACE> impl)\
+    {                                                                   \
+        if (!I##INTERFACE::default_impl && impl) {                      \
+            I##INTERFACE::default_impl = std::move(impl);               \
+            return true;                                                \
+        }                                                               \
+        return false;                                                   \
+    }                                                                   \
+    const std::unique_ptr<I##INTERFACE>& I##INTERFACE::getDefaultImpl() \
+    {                                                                   \
+        return I##INTERFACE::default_impl;                              \
+    }                                                                   \
     I##INTERFACE::I##INTERFACE() { }                                    \
     I##INTERFACE::~I##INTERFACE() { }                                   \