X-Git-Url: https://git.donarmstrong.com/?a=blobdiff_plain;f=lily%2Fbook-scheme.cc;h=c63f47dd078b49597c22ee8aeaef54368cb564d6;hb=97a0169312a260933246ab224e4f8b0969871dd5;hp=cf35a7c1bdf0adcdc87a0eac3a68545c401c9b78;hpb=fe4893be240c78a35deff5e86af3d7d1200a478b;p=lilypond.git

diff --git a/lily/book-scheme.cc b/lily/book-scheme.cc
index cf35a7c1bd..c63f47dd07 100644
--- a/lily/book-scheme.cc
+++ b/lily/book-scheme.cc
@@ -152,7 +152,7 @@ LY_DEFINE (ly_book_header, "ly:book-header",
 {
   LY_ASSERT_SMOB (Book, book, 1);
   Book *b = unsmob<Book> (book);
-  return b->header_ ? b->header_ : SCM_BOOL_F;
+  return ly_is_module (b->header_) ? b->header_ : SCM_BOOL_F;
 }
 
 LY_DEFINE (ly_book_set_header_x, "ly:book-set-header!",
@@ -178,4 +178,4 @@ LY_DEFINE (ly_book_scores, "ly:book-scores",
 }
 
 
-const char Book::type_p_name_[] = "ly:book?";
+const char * const Book::type_p_name_ = "ly:book?";