diff --git a/platforms/nuttx/src/px4/common/SerialImpl.cpp b/platforms/nuttx/src/px4/common/SerialImpl.cpp
index 4264976f4471..904d6124b132 100644
--- a/platforms/nuttx/src/px4/common/SerialImpl.cpp
+++ b/platforms/nuttx/src/px4/common/SerialImpl.cpp
@@ -339,7 +339,7 @@ ssize_t SerialImpl::write(const void *buffer, size_t buffer_size)
 	}
 
 	int written = ::write(_serial_fd, buffer, buffer_size);
-	::fsync(_serial_fd);
+	tcdrain(_serial_fd); // Wait until all output is transmitted
 
 	if (written < 0) {
 		PX4_ERR("%s write error %d", _port, written);