diff --git a/examples/osd/arduino-sketch/sketch.pde b/examples/osd/arduino-sketch/sketch.pde
index 13da7e6bb..ef47d4271 100644
--- a/examples/osd/arduino-sketch/sketch.pde
+++ b/examples/osd/arduino-sketch/sketch.pde
@@ -13,7 +13,7 @@
 extern "C" {
 #include <stdio.h>
 #include "led_pwm.h"
-#define LED_PIN 5
+#define LED_PIN 4
 
 uint8_t  pwm             = 128;
 uint8_t  period_100ms    = 10; /* one second */
diff --git a/platform/osd-merkur/dev/hw-arduino.h b/platform/osd-merkur/dev/hw-arduino.h
index 1894d23cc..bcd626ec6 100644
--- a/platform/osd-merkur/dev/hw-arduino.h
+++ b/platform/osd-merkur/dev/hw-arduino.h
@@ -59,11 +59,11 @@ extern "C"{
  * contiki for sleep/wakeup timing and is not usable for PWM.
  */
 #define digitalPinToTimer(pin)                \
-    ( (pin) == 3                              \
+    ( (pin) == 2                              \
     ? TIMER3A                                 \
-    : ( (pin) == 4                            \
+    : ( (pin) == 3                            \
       ? TIMER3B                               \
-      : ((pin == 5) ? TIMER3C : NOT_ON_TIMER) \
+      : ((pin == 4) ? TIMER3C : NOT_ON_TIMER) \
       )                                       \
     )