diff --git a/src/proto/ex_docmd.pro b/src/proto/ex_docmd.pro
index 3fd20b2..3bd7705 100644
--- a/src/proto/ex_docmd.pro
+++ b/src/proto/ex_docmd.pro
@@ -66,8 +66,8 @@
 void ex_normal(exarg_T *eap);
 void exec_normal_cmd(char_u *cmd, int remap, int silent);
 void exec_normal(int was_typed, int use_vpeekc, int may_use_terminal_loop);
-int find_cmdline_var(char_u *src, int *usedlen);
-char_u *eval_vars(char_u *src, char_u *srcstart, int *usedlen, linenr_T *lnump, char **errormsg, int *escaped, int empty_is_error);
+int find_cmdline_var(char_u *src, size_t *usedlen);
+char_u *eval_vars(char_u *src, char_u *srcstart, size_t *usedlen, linenr_T *lnump, char **errormsg, int *escaped, int empty_is_error);
 char_u *expand_sfile(char_u *arg);
 void dialog_msg(char_u *buff, char *format, char_u *fname);
 void set_no_hlsearch(int flag);
diff --git a/src/proto/filepath.pro b/src/proto/filepath.pro
index fd8de80..53fa4ec 100644
--- a/src/proto/filepath.pro
+++ b/src/proto/filepath.pro
@@ -1,5 +1,5 @@
 /* filepath.c */
-int modify_fname(char_u *src, int tilde_file, int *usedlen, char_u **fnamep, char_u **bufp, int *fnamelen);
+int modify_fname(char_u *src, int tilde_file, size_t *usedlen, char_u **fnamep, char_u **bufp, int *fnamelen);
 void shorten_dir(char_u *str);
 int file_is_readable(char_u *fname);
 void f_chdir(typval_T *argvars, typval_T *rettv);