diff --git a/stepmania/src/RageSoundReader_FileReader.h b/stepmania/src/RageSoundReader_FileReader.h
index a3d8e32eb1..749fcdcd97 100644
--- a/stepmania/src/RageSoundReader_FileReader.h
+++ b/stepmania/src/RageSoundReader_FileReader.h
@@ -24,6 +24,7 @@ public:
 	};
 	virtual OpenResult Open(RString filename) = 0;
 	virtual bool IsStreamingFromDisk() const { return true; }
+	virtual float GetStreamToSourceRatio() const { return 1.0f; }
 
 	static SoundReader *OpenFile( RString filename, RString &error );