diff --git a/src/PubSubClient.h b/src/PubSubClient.h
index 2fd6f1d..9fb8bcc 100755
--- a/src/PubSubClient.h
+++ b/src/PubSubClient.h
@@ -94,7 +94,7 @@ private:
    unsigned long lastInActivity;
    bool pingOutstanding;
    MQTT_CALLBACK_SIGNATURE;
-   uint16_t readPacket(uint8_t*);
+   uint32_t readPacket(uint8_t*);
    boolean readByte(uint8_t * result);
    boolean readByte(uint8_t * result, uint16_t * index);
    boolean write(uint8_t header, uint8_t* buf, uint16_t length);