diff --git a/src/PubSubClient.cpp b/src/PubSubClient.cpp
index 29fbbfa..a8c0560 100755
--- a/src/PubSubClient.cpp
+++ b/src/PubSubClient.cpp
@@ -102,18 +102,18 @@ PubSubClient::PubSubClient(const char* domain, uint16_t port, MQTT_CALLBACK_SIGN
 }
 
 boolean PubSubClient::connect(const char *id) {
-    return connect(id,NULL,NULL,0,0,0,0);
+    return connect(id,NULL,NULL,0,0,0,0,1);
 }
 
 boolean PubSubClient::connect(const char *id, const char *user, const char *pass) {
-    return connect(id,user,pass,0,0,0,0);
+    return connect(id,user,pass,0,0,0,0,1);
 }
 
 boolean PubSubClient::connect(const char *id, const char* willTopic, uint8_t willQos, boolean willRetain, const char* willMessage) {
-    return connect(id,NULL,NULL,willTopic,willQos,willRetain,willMessage);
+    return connect(id,NULL,NULL,willTopic,willQos,willRetain,willMessage,1);
 }
 
-boolean PubSubClient::connect(const char *id, const char *user, const char *pass, const char* willTopic, uint8_t willQos, boolean willRetain, const char* willMessage) {
+boolean PubSubClient::connect(const char *id, const char *user, const char *pass, const char* willTopic, uint8_t willQos, boolean willRetain, const char* willMessage, boolean cleanSession) {
     if (!connected()) {
         int result = 0;
 
@@ -143,9 +143,12 @@ boolean PubSubClient::connect(const char *id, const char *user, const char *pass
             if (willTopic) {
                 v = 0x06|(willQos<<3)|(willRetain<<5);
             } else {
-                v = 0x02;
+                v = 0;
             }
 
+            if (cleanSession)
+                v = v|0x02;
+
             if(user != NULL) {
                 v = v|0x80;
 
diff --git a/src/PubSubClient.h b/src/PubSubClient.h
index be4bd67..97f92ec 100755
--- a/src/PubSubClient.h
+++ b/src/PubSubClient.h
@@ -125,7 +125,7 @@ public:
    boolean connect(const char* id);
    boolean connect(const char* id, const char* user, const char* pass);
    boolean connect(const char* id, const char* willTopic, uint8_t willQos, boolean willRetain, const char* willMessage);
-   boolean connect(const char* id, const char* user, const char* pass, const char* willTopic, uint8_t willQos, boolean willRetain, const char* willMessage);
+   boolean connect(const char* id, const char* user, const char* pass, const char* willTopic, uint8_t willQos, boolean willRetain, const char* willMessage, boolean cleanSession);
    void disconnect();
    boolean publish(const char* topic, const char* payload);
    boolean publish(const char* topic, const char* payload, boolean retained);