diff --git a/components/esp_hw_support/esp_clk.c b/components/esp_hw_support/esp_clk.c
index 356b048fc8..3a0cef916e 100644
--- a/components/esp_hw_support/esp_clk.c
+++ b/components/esp_hw_support/esp_clk.c
@@ -46,7 +46,7 @@ extern uint32_t g_ticks_per_us_app;
 #endif
 
 static portMUX_TYPE s_esp_rtc_time_lock = portMUX_INITIALIZER_UNLOCKED;
-static RTC_DATA_ATTR uint64_t s_esp_rtc_time_us = 0, s_rtc_last_ticks = 0;
+static RTC_NOINIT_ATTR uint64_t s_esp_rtc_time_us, s_rtc_last_ticks;
 
 inline static int IRAM_ATTR s_get_cpu_freq_mhz(void)
 {
@@ -89,6 +89,10 @@ uint64_t esp_rtc_get_time_us(void)
 {
     portENTER_CRITICAL_SAFE(&s_esp_rtc_time_lock);
     const uint32_t cal = esp_clk_slowclk_cal_get();
+    if (cal == 0) {
+        s_esp_rtc_time_us = 0;
+        s_rtc_last_ticks = 0;
+    }
     const uint64_t rtc_this_ticks = rtc_time_get();
     const uint64_t ticks = rtc_this_ticks - s_rtc_last_ticks;
     /* RTC counter result is up to 2^48, calibration factor is up to 2^24,