diff --git a/main.c b/main.c
--- a/main.c
+++ b/main.c
@@ -5,8 +5,12 @@
 #include "pid.h"
 #include "states.h"
 #include "ssd1306.h"
+#ifdef MAX31855_TC_SENSOR
 #include "max31855.h"
+#endif
+#ifdef MAX31865_RTD_SENSOR
 #include "max31865.h"
+#endif
 #include "gpio.h"
 #include "spi.h"
 #include "flash.h"