diff --git a/src/lisp.h b/src/lisp.h
index f235e1f64be..c13a1e7a53a 100644
--- a/src/lisp.h
+++ b/src/lisp.h
@@ -1770,7 +1770,7 @@ extern Lisp_Object truncate_undo_list ();
 
 /* defined in textprop.c */
 extern Lisp_Object Qmodification_hooks;
-extern Lisp_Object Qrear_nonsticky;
+extern Lisp_Object Qrear_nonsticky, Qfont;
 extern Lisp_Object Qinsert_in_front_hooks, Qinsert_behind_hooks;
 extern Lisp_Object Fnext_property_change ();
 extern Lisp_Object Fnext_single_property_change ();