diff --git a/libraries/AP_Logger/AP_Logger_File.h b/libraries/AP_Logger/AP_Logger_File.h
index 07709d3e93..038324e92e 100644
--- a/libraries/AP_Logger/AP_Logger_File.h
+++ b/libraries/AP_Logger/AP_Logger_File.h
@@ -72,7 +72,7 @@ private:
     char *_write_filename;
     bool last_log_is_marked_discard;
     uint32_t _last_write_ms;
-#if AP_RTC_ENABLED
+#if AP_RTC_ENABLED && CONFIG_HAL_BOARD == HAL_BOARD_CHIBIOS
     bool _need_rtc_update;
 #endif