diff --git a/src/devices/sound/ay8910.h b/src/devices/sound/ay8910.h
index a3cc28af0be..c4ea3f0f603 100644
--- a/src/devices/sound/ay8910.h
+++ b/src/devices/sound/ay8910.h
@@ -156,7 +156,7 @@ protected:
 	// device-level overrides
 	virtual void device_start() override;
 	virtual void device_reset() override;
-	void device_clock_changed() override;
+	virtual void device_clock_changed() override;
 
 	// sound stream update overrides
 	virtual void sound_stream_update(sound_stream &stream, stream_sample_t **inputs, stream_sample_t **outputs, int samples) override;