diff --git a/authfs/src/file.rs b/authfs/src/file.rs
index 703eddb..947b59f 100644
--- a/authfs/src/file.rs
+++ b/authfs/src/file.rs
@@ -10,7 +10,7 @@
 
 use crate::common::CHUNK_SIZE;
 use authfs_aidl_interface::aidl::com::android::virt::fs::IVirtFdService::IVirtFdService;
-use authfs_aidl_interface::binder::{get_interface, Strong};
+use authfs_aidl_interface::binder::Strong;
 
 pub type VirtFdService = Strong<dyn IVirtFdService>;
 
@@ -18,17 +18,7 @@
 
 pub const RPC_SERVICE_PORT: u32 = 3264;
 
-fn get_local_binder() -> io::Result<VirtFdService> {
-    let service_name = "authfs_fd_server";
-    get_interface(service_name).map_err(|e| {
-        io::Error::new(
-            io::ErrorKind::AddrNotAvailable,
-            format!("Cannot reach authfs_fd_server binder service: {}", e),
-        )
-    })
-}
-
-fn get_rpc_binder(cid: u32) -> io::Result<VirtFdService> {
+pub fn get_rpc_binder_service(cid: u32) -> io::Result<VirtFdService> {
     // SAFETY: AIBinder returned by RpcClient has correct reference count, and the ownership can be
     // safely taken by new_spibinder.
     let ibinder = unsafe {
@@ -46,14 +36,6 @@
     }
 }
 
-pub fn get_binder_service(cid: Option<u32>) -> io::Result<VirtFdService> {
-    if let Some(cid) = cid {
-        get_rpc_binder(cid)
-    } else {
-        get_local_binder()
-    }
-}
-
 /// A trait for reading data by chunks. Chunks can be read by specifying the chunk index. Only the
 /// last chunk may have incomplete chunk size.
 pub trait ReadByChunk {
diff --git a/authfs/src/main.rs b/authfs/src/main.rs
index e004b81..c85d801 100644
--- a/authfs/src/main.rs
+++ b/authfs/src/main.rs
@@ -55,7 +55,7 @@
 
     /// CID of the VM where the service runs.
     #[structopt(long)]
-    cid: Option<u32>,
+    cid: u32,
 
     /// Extra options to FUSE
     #[structopt(short = "o")]
@@ -275,7 +275,7 @@
     let mut file_pool = BTreeMap::new();
 
     if args.has_remote_files() {
-        let service = file::get_binder_service(args.cid)?;
+        let service = file::get_rpc_binder_service(args.cid)?;
 
         for config in &args.remote_ro_file {
             file_pool.insert(