diff --git a/main/can.c b/main/can.c
--- a/main/can.c
+++ b/main/can.c
@@ -5,6 +5,9 @@
 #include "can.h"
 #include "esp_log.h"
 #include "driver/twai.h"
+#include "freertos/FreeRTOS.h"
+#include "freertos/task.h"
+#include "freertos/event_groups.h"
 
 // EMZ FIXME
 #define TX_GPIO_NUM 5