diff --git a/src/proto/spell.pro b/src/proto/spell.pro
index 9ed775b..5c399b3 100644
--- a/src/proto/spell.pro
+++ b/src/proto/spell.pro
@@ -3,6 +3,7 @@
 int spell_move_to __ARGS((win_T *wp, int dir, int allwords, int curline, hlf_T *attrp));
 void spell_cat_line __ARGS((char_u *buf, char_u *line, int maxlen));
 char_u *did_set_spelllang __ARGS((win_T *wp));
+void spell_delete_wordlist __ARGS((void));
 void spell_free_all __ARGS((void));
 void spell_reload __ARGS((void));
 int spell_check_msm __ARGS((void));