diff --git a/src/proto/evalfunc.pro b/src/proto/evalfunc.pro
index 6cc81db..c649b86 100644
--- a/src/proto/evalfunc.pro
+++ b/src/proto/evalfunc.pro
@@ -4,7 +4,7 @@
 int find_internal_func(char_u *name);
 int has_internal_func(char_u *name);
 char *internal_func_name(int idx);
-int internal_func_check_arg_types(type_T *types, int idx, int argcount);
+int internal_func_check_arg_types(type_T **types, int idx, int argcount);
 type_T *internal_func_ret_type(int idx, int argcount, type_T **argtypes);
 int check_internal_func(int idx, int argcount);
 int call_internal_func(char_u *name, int argcount, typval_T *argvars, typval_T *rettv);