diff --git a/serial-unix/src/tty.rs b/serial-unix/src/tty.rs
index 1beddc0..e64c0c2 100644
--- a/serial-unix/src/tty.rs
+++ b/serial-unix/src/tty.rs
@@ -28,6 +28,7 @@ const O_NOCTTY: c_int = 0;
 /// A TTY-based serial port implementation.
 ///
 /// The port will be closed when the value is dropped.
+#[derive(Debug)]
 pub struct TTYPort {
     fd: RawFd,
     timeout: Duration,
diff --git a/serial-windows/src/com.rs b/serial-windows/src/com.rs
index ba1b0cb..503ce58 100644
--- a/serial-windows/src/com.rs
+++ b/serial-windows/src/com.rs
@@ -17,6 +17,7 @@ use ffi::*;
 /// A serial port implementation for Windows COM ports.
 ///
 /// The port will be closed when the value is dropped.
+#[derive(Debug)]
 pub struct COMPort {
     handle: HANDLE,
     timeout: Duration,