diff --git a/core/src/signal_path/source.h b/core/src/signal_path/source.h
index d6183e19..5021ea2d 100644
--- a/core/src/signal_path/source.h
+++ b/core/src/signal_path/source.h
@@ -51,6 +51,6 @@ private:
     double tuneOffset;
     double currentFreq;
     double ifFreq = 0.0;
-    TuningMode tuneMode;
+    TuningMode tuneMode = TuningMode::NORMAL;
     dsp::stream<dsp::complex_t> nullSource;
 };
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