diff --git a/components/esp8266/source/phy_init.c b/components/esp8266/source/phy_init.c
index 9fc23207..700f4aaa 100644
--- a/components/esp8266/source/phy_init.c
+++ b/components/esp8266/source/phy_init.c
@@ -394,6 +394,7 @@ void esp_phy_init_clk(void)
 #else
     const uint32_t uart_baudrate = 74880; // ROM default baudrate
 #endif
+    extern int rtc_init(void);
 
     init_data = esp_phy_get_init_data();
     if (init_data == NULL) {
@@ -408,6 +409,7 @@ void esp_phy_init_clk(void)
     uart_tx_wait_idle(1);
     uart_div_modify(1, UART_CLK_FREQ / uart_baudrate);
 
+    rtc_init();
     rtc_init_clk(buf);
 
     esp_phy_release_init_data(init_data);
diff --git a/components/esp8266/source/startup.c b/components/esp8266/source/startup.c
index 6465cb4c..d7b5a98e 100644
--- a/components/esp8266/source/startup.c
+++ b/components/esp8266/source/startup.c
@@ -42,7 +42,6 @@
 extern esp_err_t esp_pthread_init(void);
 extern void chip_boot(void);
 extern int base_gpio_init(void);
-extern int rtc_init(void);
 
 static inline int should_load(uint32_t load_addr)
 {
@@ -71,7 +70,6 @@ static void user_init_entry(void *param)
     for (func = &__init_array_start; func < &__init_array_end; func++)
         func[0]();
 
-    rtc_init();
     esp_phy_init_clk();
     assert(base_gpio_init() == 0);