diff --git a/src/demoreader.cpp b/src/demoreader.cpp
--- a/src/demoreader.cpp
+++ b/src/demoreader.cpp
@@ -85,3 +85,8 @@ void DemoReader::onNumChannelsChanged(un
     _numChannels = value;
     updateNumChannels();
 }
+
+void DemoReader::onDataReady()
+{
+    // intentionally empty, required by AbstractReader
+}