diff --git a/components/log/src/log.c b/components/log/src/log.c
index bbba5bc340..1724db2c59 100644
--- a/components/log/src/log.c
+++ b/components/log/src/log.c
@@ -83,7 +83,7 @@ void __attribute__((optimize("-O3"))) esp_log(esp_log_config_t config, const cha
 #else // ESP_LOG_VERSION == 2
     if (is_level_loggable(config)) {
 #endif
-        va_list args;
+        va_list args = {0};
         va_start(args, format);
         esp_log_va(config, tag, format, args);
         va_end(args);
diff --git a/components/log/src/log_print.c b/components/log/src/log_print.c
index fc7f78618d..a10a5f9cdb 100644
--- a/components/log/src/log_print.c
+++ b/components/log/src/log_print.c
@@ -12,7 +12,7 @@
 
 void esp_log_printf(esp_log_config_t config, const char *format, ...)
 {
-    va_list args;
+    va_list args = {0};
     va_start(args, format);
     esp_log_vprintf(config, format, args);
     va_end(args);
diff --git a/components/log/src/os/log_write.c b/components/log/src/os/log_write.c
index 810fd86adf..0e5bbad056 100644
--- a/components/log/src/os/log_write.c
+++ b/components/log/src/os/log_write.c
@@ -37,7 +37,7 @@ void esp_log_write(esp_log_level_t level,
                    const char *tag,
                    const char *format, ...)
 {
-    va_list list;
+    va_list list = {0};
     va_start(list, format);
     esp_log_va(ESP_LOG_CONFIG_INIT(level), tag, format, list);
     va_end(list);