diff --git a/components/newlib/port/esp_time_impl.c b/components/newlib/port/esp_time_impl.c
index 179702428b..bb3bc77bb3 100644
--- a/components/newlib/port/esp_time_impl.c
+++ b/components/newlib/port/esp_time_impl.c
@@ -51,7 +51,7 @@
 // Offset between FRC timer and the RTC.
 // Initialized after reset or light sleep.
 #if defined(CONFIG_ESP_TIME_FUNCS_USE_RTC_TIMER) && defined(CONFIG_ESP_TIME_FUNCS_USE_ESP_TIMER)
-uint64_t s_microseconds_offset;
+uint64_t s_microseconds_offset = 0;
 #endif
 
 #ifndef CONFIG_ESP_TIME_FUNCS_USE_RTC_TIMER