diff --git a/the-cup.ino b/the-cup.ino
index 7eaace2..6614c68 100644
--- a/the-cup.ino
+++ b/the-cup.ino
@@ -26,8 +26,9 @@
 #include <MFRC522Debug.h>
 
 #define LED_PIN 16
+#define SS_PIN 4
 
-MFRC522DriverPinSimple ss_1_pin(4); // Configurable, take an unused pin, only HIGH/LOW required, must be different to SS 2.
+MFRC522DriverPinSimple ss_1_pin(SS_PIN); // Configurable, take an unused pin, only HIGH/LOW required, must be different to SS 2.
 
 MFRC522DriverSPI driver_1{ss_1_pin};