--- a/main/dcf77tx.h	Fri Oct 20 15:57:56 2023 +0200
+++ b/main/dcf77tx.h	Fri Oct 20 20:29:52 2023 +0200
@@ -30,6 +30,7 @@
 #include "esp_wpa2.h"
 #include "esp_netif_sntp.h"
 #include "esp_sntp.h"
+#include "esp_timer.h"
 #include "nvs_flash.h"