diff --git a/devfs_rpc/src/lib.rs b/devfs_rpc/src/lib.rs
index a7bb74c..1da4867 100644
--- a/devfs_rpc/src/lib.rs
+++ b/devfs_rpc/src/lib.rs
@@ -45,7 +45,7 @@ fn callback(call: IncomingCall) {
     let server_lock = SERVER.read();
     let server = server_lock.as_ref().unwrap();
     if call.func == 0 {
-        let kind = postcard::from_bytes(&call.args).unwrap();
+        let kind = postcard::from_bytes(&call.args()).unwrap();
         let ret = postcard::to_stdvec(&server.register_dev(call.from, kind)).unwrap();
         call.send_return(&ret);
     }