diff --git a/src_main/io/piserial.cpp b/src_main/io/piserial.cpp
index 4520f0b6..2fe40c1d 100755
--- a/src_main/io/piserial.cpp
+++ b/src_main/io/piserial.cpp
@@ -831,10 +831,10 @@ void PISerial::threadedReadBufferSizeChanged() {
 #ifndef WINDOWS
 	serial_struct ss;
 	ioctl(fd, TIOCGSERIAL, &ss);
-	piCoutObj << "b" << ss.xmit_fifo_size;
-	ss.xmit_fifo_size = threadedReadBufferSize();
+	//piCoutObj << "b" << ss.xmit_fifo_size;
+	ss.xmit_fifo_size = piMaxi(threadedReadBufferSize(), 4096);
 	ioctl(fd, TIOCSSERIAL, &ss);
-	ioctl(fd, TIOCGSERIAL, &ss);
-	piCoutObj << "a" << ss.xmit_fifo_size;
+	//ioctl(fd, TIOCGSERIAL, &ss);
+	//piCoutObj << "a" << ss.xmit_fifo_size;
 #endif
 }