diff --git a/Source/Project64-audio/Driver/SoundBase.h b/Source/Project64-audio/Driver/SoundBase.h
index 9a6a2c019..1ac71f71a 100644
--- a/Source/Project64-audio/Driver/SoundBase.h
+++ b/Source/Project64-audio/Driver/SoundBase.h
@@ -28,6 +28,7 @@ public:
     void AI_Startup();
     void AI_Shutdown();
     void AI_Update(bool Wait);
+    uint32_t AI_ReadLength();
 
     virtual void SetFrequency(uint32_t Frequency);
     virtual void StartAudio();
@@ -52,4 +53,4 @@ private:
     uint32_t m_CurrentWriteLoc; // Currently writing Buffer
     uint8_t m_Buffer[MAX_SIZE]; // Emulated buffers
     bool m_SyncAudio;
-};
\ No newline at end of file
+};