diff --git a/doc/etc/reference.man b/doc/etc/reference.man
index b2d9b1ac..ff55cfda 100644
--- a/doc/etc/reference.man
+++ b/doc/etc/reference.man
@@ -120,6 +120,9 @@ with this program. If not, see <http://www.gnu.org/licenses/>.
 .\" ----------  Include the Manual Pages  -------------------------------------
 .\"
 .so etc/ref-parts.so
+.\" Sync before TOC to avoid wrong position of the last PDF outline entry when
+.\" moving TOC up with psselect. It would be included in the TOC page(s).
+.pdfsync
 .\"
 .\" ----------  Include the Table of Contents  --------------------------------
 .\"