diff --git a/public/filesystem.h b/public/filesystem.h
index 070d83bc..16e4663c 100644
--- a/public/filesystem.h
+++ b/public/filesystem.h
@@ -566,7 +566,7 @@ public:
 	//--------------------------------------------------------
 
 	virtual FileNameHandle_t	FindOrAddFileName( char const *pFileName ) = 0;
-	virtual bool				String( const FileNameHandle_t& handle, char *buf, int buflen ) = 0;
+	virtual bool				String( const FileNameHandle_t& handle, CBufferString &buf ) = 0;
 
 	virtual void			Trace_DumpUnclosedFiles() = 0;