diff --git a/components/esp_system/port/brownout.c b/components/esp_system/port/brownout.c
index d2cf744975..5472303fdf 100644
--- a/components/esp_system/port/brownout.c
+++ b/components/esp_system/port/brownout.c
@@ -29,7 +29,7 @@
 #define BROWNOUT_DET_LVL 0
 #endif
 
-static __attribute__((unused)) DRAM_ATTR const char *TAG = "BOD";
+static __attribute__((unused)) DRAM_ATTR const char TAG[] = "BOD";
 
 #if CONFIG_ESP_SYSTEM_BROWNOUT_INTR
 IRAM_ATTR static void rtc_brownout_isr_handler(void *arg)