diff --git a/platform/qt/dmxwidget/dmxwidget.cpp b/platform/qt/dmxwidget/dmxwidget.cpp
index 48b87ea..96ffc24 100644
--- a/platform/qt/dmxwidget/dmxwidget.cpp
+++ b/platform/qt/dmxwidget/dmxwidget.cpp
@@ -75,7 +75,7 @@ void DmxWidget::parseMessageBuffer()
     else if (offset > 0)
       message_rx_buffer_.remove(0, offset);    // delimiter now at start of buffer
     return (message_rx_buffer_.size() >= fixed_length
-            && message_rx_buffer_[0] == ENTTEC::Pro::START_DELIMITER);
+            && (uint8_t)message_rx_buffer_[0] == ENTTEC::Pro::START_DELIMITER);
   };
 
   while(fast_forward())