diff --git a/components/esp32/esp_timer.c b/components/esp32/esp_timer.c
index 78f004acf..3f5ff2e16 100644
--- a/components/esp32/esp_timer.c
+++ b/components/esp32/esp_timer.c
@@ -286,8 +286,10 @@ static void timer_process_alarm(esp_timer_dispatch_t dispatch_method)
         uint64_t callback_start = now;
         s_timer_in_callback = it;
 #endif
+        esp_timer_cb_t callback = it->callback;
+        void* arg = it->arg;
         timer_list_unlock();
-        (*it->callback)(it->arg);
+        (*callback)(arg);
         timer_list_lock();
         now = esp_timer_impl_get_time();
 #if WITH_PROFILING