diff --git a/docs/Makefile.am b/docs/Makefile.am
index 49c40034..e7265177 100644
--- a/docs/Makefile.am
+++ b/docs/Makefile.am
@@ -5,6 +5,6 @@ SUBDIRS = lasso-book
 if ENABLE_GTK_DOC
 SUBDIRS += reference
 else
-DIST_SUBDIRS = reference
+DIST_SUBDIRS = reference lasso-book
 endif