X-Git-Url: https://git.donarmstrong.com/?a=blobdiff_plain;f=lily%2Finclude%2Fbook.hh;h=3ea6c2c550b0346db2e77d88903df91735c6a2b4;hb=2a66e23f356503ef916d51efa3f00cae5958dc48;hp=6b1c2bfb14ca48e7a60380fcab1b3b883d9e7601;hpb=c054eb280fd9953596eb164f67b0f9d5555c5a32;p=lilypond.git

diff --git a/lily/include/book.hh b/lily/include/book.hh
index 6b1c2bfb14..3ea6c2c550 100644
--- a/lily/include/book.hh
+++ b/lily/include/book.hh
@@ -29,7 +29,7 @@
 class Book : public Smob<Book>
 {
 public:
-  SCM mark_smob ();
+  SCM mark_smob () const;
   static const char type_p_name_[];
   virtual ~Book ();
   SCM header_;