diff --git a/components/newlib/time.c b/components/newlib/time.c
index 1655c0b8e..c6a1e7024 100644
--- a/components/newlib/time.c
+++ b/components/newlib/time.c
@@ -229,7 +229,11 @@ uint32_t system_get_current_time(void) __attribute__((alias("system_get_time")))
 
 uint32_t system_relative_time(uint32_t current_time)
 {
-    return system_get_time() - current_time;
+#if defined( WITH_FRC1 ) || defined( WITH_RTC )
+    return get_time_since_boot() - current_time;
+#else
+    return 0;
+#endif
 }
 
 uint64_t system_get_rtc_time(void)