diff --git a/firmware/firmware.ino b/firmware/firmware.ino
index 8112c1a..bc1b24e 100644
--- a/firmware/firmware.ino
+++ b/firmware/firmware.ino
@@ -50,7 +50,7 @@ typedef struct __attribute__((packed)) cardData {
 #define LED_ERROR_BLINK_TIME 50
 
 #define EEPROM_SIZE 4095
-#define EEPROM_END_MARKER '$'
+#define EEPROM_END_MARKER '\0'
 
 enum wifiStates
 {