diff --git a/libs/binder/IInterface.cpp b/libs/binder/IInterface.cpp
new file mode 100644
index 0000000..29acf5d
--- /dev/null
+++ b/libs/binder/IInterface.cpp
@@ -0,0 +1,42 @@
+/*
+ * Copyright (C) 2005 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <binder/IInterface.h>
+
+namespace android {
+
+// ---------------------------------------------------------------------------
+
+IInterface::IInterface() 
+    : RefBase() {
+}
+
+IInterface::~IInterface() {
+}
+
+sp<IBinder> IInterface::asBinder()
+{
+    return this ? onAsBinder() : NULL;
+}
+
+sp<const IBinder> IInterface::asBinder() const
+{
+    return this ? const_cast<IInterface*>(this)->onAsBinder() : NULL;
+}
+
+// ---------------------------------------------------------------------------
+
+}; // namespace android