diff --git a/frida_core/src/linux_tun.rs b/frida_core/src/linux_tun.rs
index ffbcb03..a58ac43 100644
--- a/frida_core/src/linux_tun.rs
+++ b/frida_core/src/linux_tun.rs
@@ -32,12 +32,14 @@ pub struct DeviceReader {
 
 impl DeviceWriter {
     pub async fn write(&self, buf: &Vec<u8>) -> Result<usize, Box<dyn Error>> {
-        self.writer.send_all(buf).await
+        self.writer.send_all(buf).await?;
+        Ok(0)
     }
 }
 
 impl DeviceReader {
     pub async fn read(&self, buf: &mut Vec<u8>) -> Result<usize, Box<dyn Error>> {
-        self.reader.recv(buf).await
+        let n = self.reader.recv(buf).await?;
+        Ok(n)
     }
 }
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