diff --git a/src/pubsubc.h b/src/pubsubc.h
index b255c3b..edebcb4 100644
--- a/src/pubsubc.h
+++ b/src/pubsubc.h
@@ -22,7 +22,7 @@
 
 // MQTT_MAX_PACKET_SIZE : Maximum packet size. Override with setBufferSize().
 #ifndef MQTT_MAX_PACKET_SIZE
-#define MQTT_MAX_PACKET_SIZE 256
+#define MQTT_MAX_PACKET_SIZE 512
 #endif
 
 // MQTT_KEEPALIVE : keepAlive interval in Seconds. Override with setKeepAlive()