diff --git a/cpu/esp_common/freertos/portable.c b/cpu/esp_common/freertos/portable.c
index b5b29a8808..edf4fe4c68 100644
--- a/cpu/esp_common/freertos/portable.c
+++ b/cpu/esp_common/freertos/portable.c
@@ -17,6 +17,7 @@
 
 #include "esp_common.h"
 #include "log.h"
+#include "timex.h"
 
 #include "freertos/FreeRTOS.h"