diff --git a/hardware/common/serial.c b/hardware/common/serial.c
index 6bf0e402..3ecd124e 100644
--- a/hardware/common/serial.c
+++ b/hardware/common/serial.c
@@ -98,8 +98,7 @@ int serial_close(int fd)
 int serial_flush(int fd)
 {
 
-	tcflush(fd, TCIOFLUSH);
-
+	return tcflush(fd, TCIOFLUSH);
 }
 
 void *serial_backup_params(int fd)
diff --git a/sigrok.h b/sigrok.h
index ec1b0180..a1531bf7 100644
--- a/sigrok.h
+++ b/sigrok.h
@@ -429,6 +429,7 @@ int ezusb_upload_firmware(libusb_device *dev, int configuration,
 GSList *list_serial_ports(void);
 int serial_open(const char *pathname, int flags);
 int serial_close(int fd);
+int serial_flush(int fd);
 void *serial_backup_params(int fd);
 void serial_restore_params(int fd, void *backup);
 int serial_set_params(int fd, int speed, int bits, int parity, int stopbits,