diff --git a/src/proto/misc1.pro b/src/proto/misc1.pro
index 1a053e3..d7c187a 100644
--- a/src/proto/misc1.pro
+++ b/src/proto/misc1.pro
@@ -29,8 +29,8 @@
 void init_vimdir(void);
 char_u *expand_env_save(char_u *src);
 char_u *expand_env_save_opt(char_u *src, int one);
-void expand_env(char_u *src, char_u *dst, int dstlen);
-void expand_env_esc(char_u *srcp, char_u *dst, int dstlen, int esc, int one, char_u *startstr);
+size_t expand_env(char_u *src, char_u *dst, int dstlen);
+size_t expand_env_esc(char_u *srcp, char_u *dst, int dstlen, int esc, int one, char_u *startstr);
 char_u *vim_getenv(char_u *name, int *mustfree);
 void vim_unsetenv(char_u *var);
 void vim_unsetenv_ext(char_u *var);