diff --git a/Adafruit_MQTT.h b/Adafruit_MQTT.h
index de77d72..26cd1b1 100644
--- a/Adafruit_MQTT.h
+++ b/Adafruit_MQTT.h
@@ -177,8 +177,8 @@ class Adafruit_MQTT {
 
   // Publish a message to a topic using the specified QoS level.  Returns true
   // if the message was published, false otherwise.
-  bool publish(const char *topic, const char *payload, uint8_t qos = 0, bool retain = false);
-  bool publish(const char *topic, uint8_t *payload, uint16_t bLen, uint8_t qos = 0, bool retain = false);
+  bool publish(const char *topic, const char *payload, uint8_t qos = 0);
+  bool publish(const char *topic, uint8_t *payload, uint16_t bLen, uint8_t qos = 0);
 
   // Add a subscription to receive messages for a topic.  Returns true if the
   // subscription could be added or was already present, false otherwise.
@@ -246,7 +246,7 @@ class Adafruit_MQTT {
   // Functions to generate MQTT packets.
   uint8_t connectPacket(uint8_t *packet);
   uint8_t disconnectPacket(uint8_t *packet);
-  uint16_t publishPacket(uint8_t *packet, const char *topic, uint8_t *payload, uint16_t bLen, uint8_t qos, bool retain);
+  uint16_t publishPacket(uint8_t *packet, const char *topic, uint8_t *payload, uint16_t bLen, uint8_t qos);
   uint8_t subscribePacket(uint8_t *packet, const char *topic, uint8_t qos);
   uint8_t unsubscribePacket(uint8_t *packet, const char *topic);
   uint8_t pingPacket(uint8_t *packet);