diff --git a/src/file-state.h b/src/file-state.h
index 0a8a7b2..b0890a2 100644
--- a/src/file-state.h
+++ b/src/file-state.h
@@ -41,7 +41,7 @@
 class FileState : public DbHelper
 {
 public:
-  FileState (const boost::filesystem::path &path);
+  FileState (const boost::filesystem::path &path, bool cow = false);
   ~FileState ();
 
   /**