diff --git a/src/proto/spell.pro b/src/proto/spell.pro
index 900f3bf..37830ca 100644
--- a/src/proto/spell.pro
+++ b/src/proto/spell.pro
@@ -3,6 +3,7 @@
 int spell_move_to __ARGS((int dir, int allwords, int curline));
 void spell_cat_line __ARGS((char_u *buf, char_u *line, int maxlen));
 char_u *did_set_spelllang __ARGS((buf_T *buf));
+void spell_free_all __ARGS((void));
 void spell_reload __ARGS((void));
 void put_bytes __ARGS((FILE *fd, long_u nr, int len));
 void ex_mkspell __ARGS((exarg_T *eap));