diff --git a/stepmania/src/RageSoundReader.h b/stepmania/src/RageSoundReader.h
index 604a858fec..a50b916176 100644
--- a/stepmania/src/RageSoundReader.h
+++ b/stepmania/src/RageSoundReader.h
@@ -16,6 +16,7 @@ public:
 	virtual unsigned GetNumChannels() const = 0;
 	virtual bool IsStreamingFromDisk() const = 0;
 	virtual bool SetProperty( const RString &sProperty, float fValue ) { return false; }
+	virtual RageSoundReader *GetSource() { return NULL; }
 
 	/* Return values for Read(). */
 	enum {
diff --git a/stepmania/src/RageSoundReader_Filter.h b/stepmania/src/RageSoundReader_Filter.h
index 6ca2e0be57..7e8adc9aca 100644
--- a/stepmania/src/RageSoundReader_Filter.h
+++ b/stepmania/src/RageSoundReader_Filter.h
@@ -23,7 +23,7 @@ public:
 	virtual bool SetProperty( const RString &sProperty, float fValue ) { return m_pSource->SetProperty( sProperty, fValue ); }
 	virtual int GetNextSourceFrame() const { return m_pSource->GetNextSourceFrame(); }
 	virtual float GetStreamToSourceRatio() const { return m_pSource->GetStreamToSourceRatio(); }
-	RageSoundReader *GetSource() { return &*m_pSource; }
+	virtual RageSoundReader *GetSource() { return &*m_pSource; }
 
 protected:
 	HiddenPtr<RageSoundReader> m_pSource;