diff --git a/Source/Core/AudioCommon/NullSoundStream.cpp b/Source/Core/AudioCommon/NullSoundStream.cpp
index 4a02dcec2c..049ce2b269 100644
--- a/Source/Core/AudioCommon/NullSoundStream.cpp
+++ b/Source/Core/AudioCommon/NullSoundStream.cpp
@@ -2,9 +2,8 @@
 // Licensed under GPLv2+
 // Refer to the license.txt file included.
 
-#include <cstring>
-
 #include "AudioCommon/NullSoundStream.h"
+#include "Common/CommonTypes.h"
 #include "Core/HW/AudioInterface.h"
 #include "Core/HW/SystemTimers.h"
 
@@ -24,13 +23,13 @@ void NullSound::SetVolume(int volume)
 void NullSound::Update()
 {
 	// num_samples_to_render in this update - depends on SystemTimers::AUDIO_DMA_PERIOD.
-	const u32 stereo_16_bit_size = 4;
-	const u32 dma_length = 32;
+	constexpr u32 stereo_16_bit_size = 4;
+	constexpr u32 dma_length = 32;
 	const u64 audio_dma_period = SystemTimers::GetTicksPerSecond() / (AudioInterface::GetAIDSampleRate() * stereo_16_bit_size / dma_length);
 	const u64 ais_samples_per_second = 48000 * stereo_16_bit_size;
 	const u64 num_samples_to_render = (audio_dma_period * ais_samples_per_second) / SystemTimers::GetTicksPerSecond();
 
-	m_mixer->Mix(realtimeBuffer, (unsigned int)num_samples_to_render);
+	m_mixer->Mix(m_realtime_buffer.data(), (unsigned int)num_samples_to_render);
 }
 
 void NullSound::Clear(bool mute)
diff --git a/Source/Core/AudioCommon/NullSoundStream.h b/Source/Core/AudioCommon/NullSoundStream.h
index 0acdd3274a..d27ac520f1 100644
--- a/Source/Core/AudioCommon/NullSoundStream.h
+++ b/Source/Core/AudioCommon/NullSoundStream.h
@@ -4,16 +4,11 @@
 
 #pragma once
 
-#include <cstdlib>
+#include <array>
 #include "AudioCommon/SoundStream.h"
 
-#define BUF_SIZE (48000 * 4 / 32)
-
 class NullSound final : public SoundStream
 {
-	// playback position
-	short realtimeBuffer[BUF_SIZE / sizeof(short)];
-
 public:
 	bool Start() override;
 	void SoundLoop() override;
@@ -23,4 +18,10 @@ public:
 	void Update() override;
 
 	static bool isValid() { return true; }
+
+private:
+	static constexpr size_t BUFFER_SIZE = 48000 * 4 / 32;
+
+	// Playback position
+	std::array<short, BUFFER_SIZE / sizeof(short)> m_realtime_buffer;
 };