diff --git a/TNC/AudioInput.cpp b/TNC/AudioInput.cpp
index 8c8cb89..d956795 100644
--- a/TNC/AudioInput.cpp
+++ b/TNC/AudioInput.cpp
@@ -187,6 +187,7 @@ void demodulatorTask() {
         auto frame = (*demodulator)(normalized);
         if (frame)
         {
+            frame->source(hdlc::IoFrame::RF_DATA);
             if (osMessagePut(ioEventQueueHandle, (uint32_t) frame, 1) != osOK)
             {
                 hdlc::release(frame);