diff --git a/libraries/AP_HAL_SITL/UARTDriver.h b/libraries/AP_HAL_SITL/UARTDriver.h
index 1df815b55c..fbade066f2 100644
--- a/libraries/AP_HAL_SITL/UARTDriver.h
+++ b/libraries/AP_HAL_SITL/UARTDriver.h
@@ -61,9 +61,9 @@ public:
 
     enum flow_control get_flow_control(void) { return FLOW_CONTROL_ENABLE; }
 
-    virtual bool set_speed(int speed);
-    virtual void configure_parity(uint8_t v);
-    virtual void set_stop_bits(int n);
+    virtual bool set_speed(int speed) { return true; }
+    virtual void configure_parity(uint8_t v) { }
+    virtual void set_stop_bits(int n) { }
     bool set_unbuffered_writes(bool on);
 
     void _timer_tick(void);
diff --git a/libraries/AP_HAL_SITL/UART_utils.cpp b/libraries/AP_HAL_SITL/UART_utils.cpp
index eaeef096f6..8e8025b5de 100644
--- a/libraries/AP_HAL_SITL/UART_utils.cpp
+++ b/libraries/AP_HAL_SITL/UART_utils.cpp
@@ -15,7 +15,7 @@
  * with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 #include <AP_HAL/AP_HAL.h>
-#if CONFIG_HAL_BOARD == HAL_BOARD_SITL
+#if CONFIG_HAL_BOARD == HAL_BOARD_SITL && !defined(__CYGWIN__)
 
 #include "UARTDriver.h"