diff --git a/src/proto/testing.pro b/src/proto/testing.pro
index 2b001a5..7542ccb 100644
--- a/src/proto/testing.pro
+++ b/src/proto/testing.pro
@@ -28,6 +28,8 @@
 void f_test_null_list(typval_T *argvars, typval_T *rettv);
 void f_test_null_partial(typval_T *argvars, typval_T *rettv);
 void f_test_null_string(typval_T *argvars, typval_T *rettv);
+void f_test_unknown(typval_T *argvars, typval_T *rettv);
+void f_test_void(typval_T *argvars, typval_T *rettv);
 void f_test_scrollbar(typval_T *argvars, typval_T *rettv);
 void f_test_setmouse(typval_T *argvars, typval_T *rettv);
 void f_test_settime(typval_T *argvars, typval_T *rettv);