diff --git a/src/framedreader.h b/src/framedreader.h
--- a/src/framedreader.h
+++ b/src/framedreader.h
@@ -57,6 +57,7 @@ private:
     bool checksumEnabled;
     bool hasSizeByte;
     unsigned frameSize;
+    bool debugModeEnabled;
 
     /// Checks the validity of syncWord and frameSize then shows an
     /// error message. Also updates `settingsInvalid`. If settings are
@@ -79,7 +80,6 @@ private:
     // `data` contains i th channels data
     void addChannelData(unsigned int channel, double* data, unsigned size);
 
-
 private slots:
     void onDataReady();