diff --git a/media/libmedia/IHDCP.cpp b/media/libmedia/IHDCP.cpp
index 1cf987a..9122f75 100644
--- a/media/libmedia/IHDCP.cpp
+++ b/media/libmedia/IHDCP.cpp
@@ -65,7 +65,7 @@
     virtual status_t setObserver(const sp<IHDCPObserver> &observer) {
         Parcel data, reply;
         data.writeInterfaceToken(IHDCP::getInterfaceDescriptor());
-        data.writeStrongBinder(observer->asBinder());
+        data.writeStrongBinder(IInterface::asBinder(observer));
         remote()->transact(HDCP_SET_OBSERVER, data, &reply);
         return reply.readInt32();
     }