diff --git a/src/main.cpp b/src/main.cpp
index 2981c56..ef9d41d 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -36,5 +36,6 @@ void loop() {
     mqtt_transfer(mqtt_client, config, data);
   }
   disconnect_mqtt(mqtt_client, config->topic);
+  free(config);
   enter_deep_sleep(false, config->sleep_time);
 }