diff --git a/src/Property/PackProperty.php b/src/Property/PackProperty.php
index 0092677..4a4b221 100644
--- a/src/Property/PackProperty.php
+++ b/src/Property/PackProperty.php
@@ -27,6 +27,7 @@ public static function connect(array $data): string
                 $tmpBody .= chr($property);
                 switch ($property) {
                     case Property::SESSION_EXPIRY_INTERVAL:
+                    case Property::MAXIMUM_PACKET_SIZE:
                         $tmpBody .= PackTool::longInt($item);
                         break;
                     case Property::AUTHENTICATION_METHOD:
@@ -39,7 +40,6 @@ public static function connect(array $data): string
                         break;
                     case Property::RECEIVE_MAXIMUM:
                     case Property::TOPIC_ALIAS_MAXIMUM:
-                    case Property::MAXIMUM_PACKET_SIZE:
                         $tmpBody .= PackTool::shortInt($item);
                         break;
                 }
diff --git a/src/Property/UnPackProperty.php b/src/Property/UnPackProperty.php
index 1c00f4d..ffec78b 100644
--- a/src/Property/UnPackProperty.php
+++ b/src/Property/UnPackProperty.php
@@ -28,6 +28,7 @@ public static function connect(int $length, string &$remaining): array
                 $remaining = substr($remaining, 1);
                 switch ($property) {
                     case Property::SESSION_EXPIRY_INTERVAL:
+                    case Property::MAXIMUM_PACKET_SIZE:
                         $properties[$key] = UnPackTool::longInt($remaining);
                         $length -= 5;
                         break;
@@ -44,7 +45,6 @@ public static function connect(int $length, string &$remaining): array
                         break;
                     case Property::RECEIVE_MAXIMUM:
                     case Property::TOPIC_ALIAS_MAXIMUM:
-                    case Property::MAXIMUM_PACKET_SIZE:
                         $properties[$key] = UnPackTool::shortInt($remaining);
                         $length -= 3;
                         break;