diff --git a/src/main.cpp b/src/main.cpp
index b87a9e5..90d54ba 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -8,26 +8,24 @@
  */
 #include "Arduino.h"
 
-#ifndef LED_BUILTIN
-#define LED_BUILTIN 13
-#endif
+#define LED_PIN 5
 
 void setup()
 {
   // initialize LED digital pin as an output.
-  pinMode(LED_BUILTIN, OUTPUT);
+  pinMode(LED_PIN, OUTPUT);
 }
 
 void loop()
 {
   // turn the LED on (HIGH is the voltage level)
-  digitalWrite(LED_BUILTIN, HIGH);
+  digitalWrite(LED_PIN, HIGH);
 
   // wait for a second
   delay(1000);
 
   // turn the LED off by making the voltage LOW
-  digitalWrite(LED_BUILTIN, LOW);
+  digitalWrite(LED_PIN, LOW);
 
    // wait for a second
   delay(1000);