diff --git a/platform/qt/dmxwidget/dmxwidget.cpp b/platform/qt/dmxwidget/dmxwidget.cpp
index 96ffc24..fba5ab8 100644
--- a/platform/qt/dmxwidget/dmxwidget.cpp
+++ b/platform/qt/dmxwidget/dmxwidget.cpp
@@ -81,8 +81,7 @@ void DmxWidget::parseMessageBuffer()
   while(fast_forward())
   {
     // read and check the data length
-    length = message_rx_buffer_[2];
-    length &= message_rx_buffer_[3] << 8;
+    length = message_rx_buffer_[2] | message_rx_buffer_[3] << 8;
     if (message_rx_buffer_.size() < length + fixed_length)
       return;                               // message in buffer is incomplete
     // look for the end delimeter