diff --git a/src_main/io/piserial.cpp b/src_main/io/piserial.cpp
index 7fe3fb83..f11ae7d1 100755
--- a/src_main/io/piserial.cpp
+++ b/src_main/io/piserial.cpp
@@ -63,6 +63,7 @@
 #  include <termios.h>
 #  include <fcntl.h>
 #  include <sys/ioctl.h>
+#  include <linux/serial.h>
 #  ifndef B50
 #    define B50       0000001
 #  endif
@@ -516,6 +517,13 @@ bool PISerial::openDevice() {
 	}
 	tcgetattr(fd, &PRIVATE->desc);
 	PRIVATE->sdesc = PRIVATE->desc;
+	serial_struct ss;
+	ioctl(fd, TIOCGSERIAL, &ss);
+	piCoutObj << "b" << ss.xmit_fifo_size;
+	ss.xmit_fifo_size = threadedReadBufferSize();
+	ioctl(fd, TIOCSSERIAL, &ss);
+	ioctl(fd, TIOCGSERIAL, &ss);
+	piCoutObj << "a" << ss.xmit_fifo_size;
 	//piCoutObj << "Initialized " << path_;
 #endif
 	applySettings();