diff --git a/src/main.rs b/src/main.rs
index 67031c2..e807315 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -82,6 +82,10 @@ impl file_rpc::Server for AhciState {
         };
         Some(device.capacity() as u64)
     }
+
+    fn dup(&self, fd: u64) -> Option<u64> {
+        Some(fd)
+    }
 }
 
 fn main() {