diff --git a/src/windows/com.rs b/src/windows/com.rs
index 0c0cb9f..a86f10d 100644
--- a/src/windows/com.rs
+++ b/src/windows/com.rs
@@ -20,6 +20,8 @@ pub struct COMPort {
     timeout: Duration
 }
 
+unsafe impl Send for COMPort {}
+
 impl COMPort {
     /// Opens a COM port as a serial device.
     ///