diff --git a/lib/src/messages/connectack/mqtt_client_mqtt_connect_ack_variable_header.dart b/lib/src/messages/connectack/mqtt_client_mqtt_connect_ack_variable_header.dart
index 21a7b49..d404a97 100644
--- a/lib/src/messages/connectack/mqtt_client_mqtt_connect_ack_variable_header.dart
+++ b/lib/src/messages/connectack/mqtt_client_mqtt_connect_ack_variable_header.dart
@@ -40,7 +40,9 @@ class MqttConnectAckVariableHeader extends MqttVariableHeader {
   @override
   void readFrom(MqttByteBuffer variableHeaderStream) {
     final ackConnectFlags = variableHeaderStream.readByte();
-    sessionPresent = ackConnectFlags == 1;
+    if (Protocol.version == MqttClientConstants.mqttV311ProtocolVersion) {
+      sessionPresent = ackConnectFlags == 1;
+    }
     readReturnCode(variableHeaderStream);
   }
 
diff --git a/test/mqtt_client_connection_unsecure_test.dart b/test/mqtt_client_connection_unsecure_test.dart
index a8c6ee1..fa6b7c8 100644
--- a/test/mqtt_client_connection_unsecure_test.dart
+++ b/test/mqtt_client_connection_unsecure_test.dart
@@ -249,12 +249,14 @@ void main() {
         final ch = SynchronousMqttServerConnectionHandler(clientEventBus,
             maxConnectionAttempts: 3, socketOptions: socketOptions);
         ch.onConnected = connectCb;
-        await ch.connect(mockBrokerAddress, mockBrokerPort,
+        final status = await ch.connect(mockBrokerAddress, mockBrokerPort,
             MqttConnectMessage().withClientIdentifier(testClientId));
         expect(ch.connectionStatus.state, MqttConnectionState.connected);
         expect(ch.connectionStatus.returnCode,
             MqttConnectReturnCode.connectionAccepted);
         expect(ch.connectionStatus.connectAckMessage, isNotNull);
+        expect(
+            status.connectAckMessage?.variableHeader.sessionPresent, isFalse);
         expect(connectCbCalled, isTrue);
         final state = ch.disconnect();
         expect(state, MqttConnectionState.disconnected);
@@ -269,7 +271,7 @@ void main() {
                   timeout: timeout));
     });
 
-    test('Successful response and disconnect with returned status', () async {
+    test('Successful response and disconnect with session present', () async {
       await IOOverrides.runZoned(() async {
         Protocol.version = MqttClientConstants.mqttV311ProtocolVersion;
         final clientEventBus = events.EventBus();