diff --git a/src/MqttClient.h b/src/MqttClient.h
index f7e7b04d..df6ebadc 100644
--- a/src/MqttClient.h
+++ b/src/MqttClient.h
@@ -17,6 +17,7 @@
 
 /* External Includes */
 #include <stdarg.h>
+#include <stdint.h>
 /* Internal Includes */
 #include "MQTTPacket/MQTTPacket.h"