diff --git a/src/proto/edit.pro b/src/proto/edit.pro
index 0fb787f..e2398c4 100644
--- a/src/proto/edit.pro
+++ b/src/proto/edit.pro
@@ -8,7 +8,7 @@
 void backspace_until_column __ARGS((int col));
 int vim_is_ctrl_x_key __ARGS((int c));
 int ins_compl_add_infercase __ARGS((char_u *str, int len, int icase, char_u *fname, int dir, int flags));
-void set_completion __ARGS((int startcol, list_T *list));
+void set_completion __ARGS((colnr_T startcol, list_T *list));
 void ins_compl_show_pum __ARGS((void));
 char_u *find_word_start __ARGS((char_u *ptr));
 char_u *find_word_end __ARGS((char_u *ptr));