diff --git a/src/proto/evalvars.pro b/src/proto/evalvars.pro
index 691eec3..bb8b5a1 100644
--- a/src/proto/evalvars.pro
+++ b/src/proto/evalvars.pro
@@ -41,6 +41,7 @@
 void set_vim_var_string(int idx, char_u *val, int len);
 void set_vim_var_list(int idx, list_T *val);
 void set_vim_var_dict(int idx, dict_T *val);
+void set_argv_var(char **argv, int argc);
 void set_reg_var(int c);
 char_u *v_exception(char_u *oldval);
 char_u *v_throwpoint(char_u *oldval);