diff --git a/include/mqtt_client.h b/include/mqtt_client.h
index 36530b5..b87a087 100755
--- a/include/mqtt_client.h
+++ b/include/mqtt_client.h
@@ -10,6 +10,7 @@
 #include <stdint.h>
 #include <stdbool.h>
 #include <string.h>
+#include "esp_err.h"
 
 #include "mqtt_config.h"