diff --git a/firmware/baseband/audio_output.cpp b/firmware/baseband/audio_output.cpp
index 824e21d6..426c19ee 100644
--- a/firmware/baseband/audio_output.cpp
+++ b/firmware/baseband/audio_output.cpp
@@ -48,7 +48,6 @@ void AudioOutput::write(
 	hpf.execute_in_place(audio);
 	deemph.execute_in_place(audio);
 
-	static uint64_t audio_present_history = 0;
 	audio_present_history = (audio_present_history << 1) | (audio_present_now ? 1 : 0);
 	const bool audio_present = (audio_present_history != 0);
 	
diff --git a/firmware/baseband/audio_output.hpp b/firmware/baseband/audio_output.hpp
index b4b59487..1aec0478 100644
--- a/firmware/baseband/audio_output.hpp
+++ b/firmware/baseband/audio_output.hpp
@@ -48,6 +48,8 @@ private:
 
 	AudioStatsCollector audio_stats;
 
+	uint64_t audio_present_history = 0;
+
 	void fill_audio_buffer(const buffer_s16_t& audio);
 	void feed_audio_stats(const buffer_s16_t& audio);
 };