diff --git a/main.cpp b/main.cpp
index 630d7d6..63968dc 100644
--- a/main.cpp
+++ b/main.cpp
@@ -38,6 +38,7 @@
 #include "mqtt.h"
 #include "particles.h"
 #include "CO2_sensor.h"
+#include "sensor.h"
 #include "button.h"
 
 /*--------------------------- Program ---------------------------------------*/