diff --git a/cubesatsim/cubesatsim.h b/cubesatsim/cubesatsim.h
index f2f888a2..74e0463b 100644
--- a/cubesatsim/cubesatsim.h
+++ b/cubesatsim/cubesatsim.h
@@ -26,6 +26,7 @@
 #include <Adafruit_BME280.h>
 #include <MPU6050_tockn.h>
 #include <EEPROM.h>
+#include <Arduino-APRS-Library.h>
 
 // Pico GPIO pin assignments
 #define LPF_PIN 8  // LPF is installed